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As it happened: Indianapolis 500
By Matt Beer, Mark Glendenning and Dan Cross
The live commentary has ended. No further updates will be posted.
15:30 Good afternoon and welcome to AUTOSPORT Race Centre Live.

Over the next few hours, we will be bring you as it happens commentary from the spectacle that is the Indianapolis 500.

15:31 The 98th running of America’s blue riband event gets underway in approximately 40 minutes, which gives us plenty of time to remind you of some of the main developments in the run up to this year’s race.

15:32 Ed Carpenter will lead the 33-car field to the green flag at approximately 17:12 UK time (BST), having topped what was a record-breaking qualifying session.

15:33 The gap between Carpenter’s pole time and that of last-place qualifier Buddy Lazier was just 2.1509s - the closest in the history of the event.

15:34 James Hinchcliffe came closest to beating Carpenter, which was a remarkable performance considering that the Canadian missed the opening days of practice while recovering from concussion he sustained in the race on the Indianapolis Motor Speedway road course a fortnight ago.

15:36 Here's our comprehensive Indy 500 qualifying report:

button Carpenter takes pole for Indy 500

15:38 Indy 500 returnee and 1995 race winner Jacques Villeneuve was solid in qualifying and starts today’s race from 27th.

15:39 Villeneuve's return marks the comeback of a driver who breaks IndyCar’s record for the longest gap between starts.

Lazier, who won 12 months after the Canadian, is also back in the field in what is a part-time campaign for the 46-year-old driver.

15:41 Those two aren't the only former Indy 500 winners in this year’s field. Far from it, in fact, as Helio Castroneves, Scott Dixon and Juan Pablo Montoya will also be wanting to kiss the bricks again today.

15:43 Montoya’s return will be an intriguing one to watch as the Colombian has been building towards this weekend.

His optimism has been backed up by his early pace on the speedway and he has routinely been among the fastest at the end of each day.

Why Montoya is still smiling

15:44 A former NASCAR foe will be joining Montoya today in the form of the infamous/notorious Kurt Busch, who becomes the fourth driver to contest both Indy and NASCAR’s 600-miler in Charlotte, which is generating a lot of interest across both motorsport disciplines.

15:46 Busch seems to have had little trouble adapting to the car - bar a shunt earlier in the week - as preparing for an oval seems relatively straightforward, but even so, he was impressively quick during the first three practice days and qualified a respectable 12th.

The 2004 NASCAR Sprint Cup champion says he must remain completely focused while on double-duty today:

button Busch: focus critical in double bid

15:50 Pre-race driver introductions completed and it's safe to say the sea of fans are immensely eager ahead of today's race. Incredible atmosphere!

15:57 It's nearly national anthem time, and that means racing isn't far away. It's not going to start immediately but tuning in now means you'll be ready and waiting.

15:58 And if you're desperate to know who is singing the The Star-Spangled Banner, it's Leann Rimes. Remember her? She had trouble fighting the moonlight, or something...

16:17 Indianapolis 500: Jim Nabors' rendition of Back Home Again in Indiana is a central part of the traditional build-up to the 500, but this year's rendition was especially poignant - the 83-year-old is performing it for the final time.

16:17 Indianapolis 500: Mary Hulman-George gives the command to start engines.

16:18 Indianapolis 500: It is an absolutely perfect day in Indianapolis - the sun is out and so are the crowds, with an estimated 250,000 packed into IMS for this 98th running of the race.

16:21 Indianapolis 500: Dario Franchitti has led a lot of laps around this place. Not sure if these ones count - he is driving the pace car as the field heads out on its parade laps - but it's still nice to see him here.

16:25 Indianapolis 500: Green flag!

16:26 Indianapolis 500: Hinchcliffe got the jump on Carpenter at the start and takes an early lead.

16:28 Indianapolis 500: Not a great start from one of 2013's heroes Carlos Munoz, who has fallen from seventh to 11th. Even worse start from Ryan Briscoe who brushed the wall on lap one, then bounced back down and tapped compatriot James Davison. Davison's car seems OK, but Briscoe has been forced to pit for a new front wing.

16:31 Indianapolis 500: The current top five: Hinchcliffe, Carpenter, Power, Castroneves, Andretti.

16:36 Indianapolis 500: Carpenter has retaken the lead. A little further back, Scott Dixon has made some early progress and is up to seventh.

16:41 Indianapolis 500: There's a lot of overtaking going on behind the leaders: Ryan Hunter-Reay has claimed 10 scalps so far and is P9; Townsend Bell has made up 11 places and is 14th.

16:42 Indianapolis 500: Lap 25 of 200 and here's the current top 10:

1 Carpenter
2 Hinchcliffe
3 Power
4 Castroneves
5 Hildebrand
6 Andretti
7 Dixon
8 Munoz
9 Hunter-Reay
10 Pagenaud

16:47 Indianapolis 500: Carpenter and Hinchcliffe have both pitted. Will Power led a lap before making his own stop, and Juan Pablo Montoya currently holds P1. He'll visit the pits any moment.

16:50 Indianapolis 500: The leaders have cycled through their first stops, and Hinchcliffe has emerged back in the lead ahead of Carpenter.

16:53 Indianapolis 500: Another lead change - Will Power made up two places in as many laps, and now in P1.

16:58 Indianapolis 500: The lead five are breaking away ever so slightly, and the fifth driver in that group - Helio Castroneves - has just been warned for blocking Marco Andretti.

17:01 Indianapolis 500: Fifty laps in the books, and those currently running towards the front of the field are:

1 Power
2 Carpenter
3 Hildebrand
4 Castroneves
5 Andretti
6 Hinchcliffe
7 Dixon
8 Munoz
9 Kanaan
10 Bell

17:06 Dale Earnhardt Jr has some words of advice for Rahal, who has had a torrid race today:

"Hate the bad luck for @GrahamRahal and his @NationalGuard crew. Keep ya heads up."

17:08 Indianapolis 500: A slight bobble from Power, and Marco Andretti swoops into the lead. The crowd goes mad.

17:10 Indianapolis 500: Andretti and Power kick off the second round of stops. Power has beaten Andretti off pit road.

Meanwhile, Buddy Lazier has been black-flagged for a pit safety violation. He's currently running 32nd.

17:14 Indianapolis 500: The new leader is Castroneves, with Andretti heading the pursuit. Power has been shuffled back to fifth.

Meanwhile, Tony Kanaan's hopes of a repeat win have been dealt a massive blow, with the Brazilian having been stuck in the pits for more than 43s.

17:18 Indianapolis 500: Kanaan is still in the pits with myriad mechanical problems, and it's a similar scene for Graham Rahal in the RLL pitbox.

17:18 Indianapolis 500: We've just reached the 75-lap mark, so here's the current top 10:

1 Castroneves
2 Andretti
3 Carpenter
4 Hunter-Reay
5 Dixon
6 Power
7 Pagenaud
8 Hinchcliffe
9 Montoya
10 Karam

17:21 Indianapolis 500: It sounds like Rahal's race is over.

"Electrical gremlin i didn't think the car ran right from the start - it was just slow. And now the car just keeps shutting off."

17:22 Marino Franchitti isn't too happy that defending race winner Kanaan is having problems today:

"Gutted for @TonyKanaan & the 10 guys, on more positive news @scottdixon9 is moving up nicely..."

17:22 Indianapolis 500: Pippa Mann is also having some sort of problem - she's around 20mph off the pace, and it has caused a few hairy moments for the cars around her. It wouldn't be a surprise to see her flagged into the pits if her speed doesn't improve shortly.

17:23 Indianapolis 500: Just as we write that, Mann is more or less back up to speed.

17:32 Indianapolis 500: Helio Castroneves veers into pitlane to get the third round of stops underway. He's happy with his car, and won't be asking for any changes.

On an unrelated note, it's surprising that we're closing in on 100 laps and haven't had a yellow yet.

17:35 Indianapolis 500: The previous first-yellow record was 66 laps, we're now up to lap 98 and no yellows, yet...

17:37 Indianapolis 500: Mid-race klaxon! Here's the top 10 on lap 100 of 200:

1 Montoya
2 Castroneves
3 Andretti
4 Carpenter
5 Montoya
6 Dixon
7 Power
8 Pagenaud
9 Hildebrand
10 Munoz

17:37 Indianapolis 500: Kanaan rejoins the race, 18 laps down. Up front, all the frontrunners have stopped and the new leader is Ryan Hunter-Reay. That's impressive considering that he started from about P74 (well, 19th...) on the grid.

One guy we've so far neglected to mention is Kurt Busch. As the race hits the half-way mark, he's sitting in 17th and within range of his targeted top-half finish.

17:44 Indianapolis 500: Castroneves reclaims the lead from Hunter-Reay. If the race continues like this, it's worth keeping an eye on Montoya - he has had better fuel mileage than his rivals in every stint to far, and is currently lurking in fifth.

17:46 Indianapolis 500: This race is flying by and the IndyCar media relations Twitter account confirms our suspicions:

"The first half of the race was the fastest 100 laps in #Indy500 history."

17:47 Indianapolis 500: Of course, if there's anybody who is enjoying this long spell under greens, it's Busch - he has an appointment 600 miles away in Charlotte later today, so every extra spare minute is helpful.

Brit Martin Plowman has been black-flagged for a pitlane safety violation.

17:48 Indianapolis 500: Hunter-Reay moves back into the lead, and at the other end of the field, Buddy Lazier retires with a mechanical problem.

17:53 Indianapolis 500: Wait, the leaders are starting to pit again already? This persisting green flag is distorting AUTOSPORT's sense of time. The possibility that we'd get this deep into the race without a caution genuinely hadn't occurred to us.

17:54 Indianapolis 500: The race has now reached 125 laps (or 312.5 miles, if that's your thing), and here's the top 10 at the moment:

1 Montoya
2 Power
3 Dixon
4 Hinchcliffe
5 Hunter-Reay
6 Bell
7 Hildebrand
8 Munoz
9 Kimball
10 Busch

17:57 Indianapolis 500: It looks like Will Power will have to wait at least another 12 months to get his face onto the Borg Warner - he has just been given a black flag for a pitlane speed violation.

17:59 Indianapolis 500: AUTOSPORT editor CHARLES BRADLEY makes a good point on Twitter:

"All this green flag running means @KurtBusch could enjoy a slap-up meal before flying to Charlotte. #Indy500."

Busch is currently running in 15th place.

18:00 Indianapolis 500: Montoya pits from the lead. That was a 33-lap stint from the Colombian ...

... who has just been issued a penalty for pitlane speeding. That's two identical penalties in less than five minutes for the Penske team.

18:02 Indianapolis 500: Montoya is now P16; Power is P19. Safe to say that they're now praying for yellows.

18:03 Indianapolis 500: Paul Tracy's reaction to Power and Montoya receiving penalties:

"Holy s*** balls , power and jpm speeding!"

Call it a hunch, but we think he's dissatisfied with the stewards' decisions...

18:11 Indianapolis 500: Penske's prayers are answered - Ganassi's Charlie Kimball spins and tags the wall, and we're under yellows for the first time today.

18:15 Indianapolis 500: Prior to the caution things were looking good for Hunter-Reay, who was sitting in second behind Marco Andretti and saving fuel while his team-mate did all the work. All five of the Andretti cars are currently in the top 10.

18:16 Indianapolis 500: The pitlane opens, and almost the entire field takes advantage of it to make a stop.

18:18 Indianapolis 500: The current top 10 during this caution period:

1 Carpenter
2 Hunter-Reay
3 Andretti
4 Dixon
5 Castroneves
6 Hinchcliffe
7 Bell
8 Munoz
9 Busch
10 Boudais

18:22 Indianapolis 500: Restart. Hunter-Reay mugs Carpenter to claim the lead; Carpenter takes it right back.

18:24 Indianapolis 500: More penalties - we believe for Villeneuve and Tagliani - for taking service in a closed pit.

Hunter-Reay has recaptured the lead from Carpenter.

18:28 Indianapolis 500: Carpenter and Hunter-Reay are still squabbling. Everyone still has to make one more stop, although Carpenter made his last visit to the pits right before that caution, and has been out for eight laps longer than the cars around him.

18:30 Indianapolis 500: Scott Dixon took some wing out during his last stop. We don't know whether that had anything to do with him just coming through Turn 4 backwards and hitting the wall.

18:32 Indianapolis 500: The cars around Dixon were lucky not to be caught up in that - as well as the spinning Ganassi car, there was quite a bit of debris. Dixon is fine.

18:33 Indianapolis 500: Newgarden's car has also come to a stop at the pit entry. Not sure what happened to him.

The pits are open, and naturally everyone dives in. This brings Carpenter back into sequence with everyone else.

18:34 Indianapolis 500: Ganassi's Mike Hull is ruling out the wing change as a factor in the accident.

Meanwhile. we've just seen a replay that solves the Newgarden mystery - he slowed for Dixon's accident, and got hit from behind by Plowman.

18:40 Indianapolis 500: Restart! Hunter-Reay leads from Carpenter ...

18:42 Indianapolis 500: ... and we're straight back under yellows. Carpenter, Hinchcliffe and Bell tried to go three-wide, through Turn 1. It didn't work: Carpenter and Hinchcliffe touch and are spat into the wall.

18:44 Indianapolis 500: There might have been contact between Bell and Carpenter immediately before Carpenter hit Hinchcliffe.

There is much arm-waving from both Carpenter and Hinch now. Both of those guys thought they had a shot at winning.

18:45 Indianapolis 500: So that's what Ed Carpenter looks like when he's angry. We'd always wondered.

18:46 Indianapolis 500: Kimball, Carpenter and Hinchcliffe have all been checked at the medical centre and cleared to drive.

18:48 Indianapolis 500: Robby Gordon reckons Hunter-Reay is odds on favourite to win today:

"RHR has this race in the bag. They are going to get stupid behind him at every re-start #indy500"

18:48 Indianapolis 500: Restart! Three-wide for second place again, but this time they get away with it.

18:50 Indianapolis 500: Lead battle is getting busy between Hunter-Reay, Andretti and Castroneves. The last dozen laps are going to be manic.

18:52 Indianapolis 500: Just 15 laps to go and Hunter-Reay leads ahead of Castroneves and Andretti.

18:54 Indianapolis 500: The lead battle has calmed down somewhat after a few frantic laps.

18:54 Indianapolis 500: Munoz, meanwhile, is about to join the leading trio as he latches on to Andretti's tail.

18:55 Indianapolis 500: Ten laps to go and yellow is waved for debris at Turn 2.

18:56 Indianapolis 500: And just as a caution is called Bell crashes heavily into the wall.

18:56 Indianapolis 500: Safe to say there is a lot of debris out there now...

18:58 Indianapolis 500: Race has been stopped with nine laps remaining. A right decision given the amount of debris that needs to be cleared.

18:59 Indianapolis 500: Cars head into the pitlane to the approval of the thousands of spectators, who appreciate the fact they will (hopefully) see a proper race to the finish.

19:00 Indianapolis 500: Carpenter has just been speaking to the media. He's pretty much laying the blame on Hinchcliffe for their earlier altercation:

"It's a good thing he already had a concussion last week."

19:06 Indianapolis 500: Paul Tracy has some advice for anyone who hid a phone in their overalls and are currently reading Twitter:

"Now this is not good for the tires , they will get much cooler than circulating , pressures can drop and change handling."

19:09 Indianapolis 500: Word has it that we'll be back up and running in a couple of minutes. Hinchcliffe, meanwhile, has been giving his side of the incident he had with Carpenter and took his share of responsibility for it.

19:10 Indianapolis 500: Engines are fired up and the drivers head back out. Two laps behind the pace car and just six until the chequered flag.

19:11 Indianapolis 500: The current top 10:

1 Hunter-Reay
2 Castroneves
3 Andretti
4 Munoz
5 Montoya
6 Busch
7 Bourdais
8 Briscoe
9 Power
10 Servia

19:13 Indianapolis 500: And we're back to racing! Hunter-Reay just about manages to fend off Castroneves who has Andretti for close comfort.

19:14 Indianapolis 500: Hunter-Reay pulls away into Turn 1, but Castroneves is keeping him honest.

19:15 Indianapolis 500: And Hunter-Reay just about manages to maintain the lead...

19:15 Indianapolis 500: ...but with three laps to Castroneves makes a dive down the inside into Turn 3! Hunter-Reay is let off and keeps pushing.

19:16 Indianapolis 500: And Castroneves passes Hunter-Reay with just two laps to go!

19:16 Indianapolis 500: Can Hunter-Reay reclaim his lead? They're going side-by-side into the final lap...

19:17 Indianapolis 500: ...and Hunter-Reay leads with just one corner to go! Fantastic final half-dozen laps!

19:18 Indianapolis 500: What a finish! Hunter-Reay claims victory by just 0.0600 seconds ahead of Castroneves!

19:19 Final top 10:

1 Hunter-Reay
2 Castroneves
3 Andretti
4 Munoz
5 Montoya
6 Busch
7 Bourdais
8 Power
9 Karam
10 Hildebrand

Villeneuve is 14th

19:20 Indianapolis 500: Hunter-Reay punches the air in celebration as he soaks up the applause from the 230,000 spectators while on his way back to the pits.

19:22 Indianapolis 500: While we wait for Hunter-Reay to celebrate in Victory Lane, Townsend Bell has been checked, cleared and released from the infield medical centre.

19:22 The NASCAR crowd has been watching avidly, here's Jimmie Johnson's verdict:

"Awesome run @KurtBusch and one heck of an effort @h3lio."

He missed RHR out!

19:22 Indianapolis 500: Hunter-Reay has a swig of milk and tells everybody that "it is a dream come true."

19:25 Indianapolis 500: Hunter-Reay tries to collect his thoughts and take in what he's accomplished:

"I didn't know if we had it. I don't even know what to think..." he says.

"I knew we had a good race car. I'm so excited right now, I don't know what to think!"

19:26 Indianapolis 500: Runner-up Castroneves took his time to get out of the car, but denies he was crying.

"No, it wasn't tears. I was a little upset - so close but so far. I'm not upset with anybody, but so close...

"Hunter-Reay did an outstanding job. We were racing clean, fighting for inches. It was a hell of a job.

"It's good when second feels this bad."

19:27 It was a miserable day for Graham Rahal, but he's pleased for the winner:

"Congrats to a truly great guy, a great champion, and a fantastic winner of the #Indy500. One of my best buddies @RyanHunterReay!"

19:27 Indianapolis 500: Hunter-Reay is the first American driver to win the Indy 500 since 2006, when Sam Hornish Jr won it for Penske.

19:29 Indianapolis 500: Montoya ended up fifth, but was fighting for victory before losing ground with that pit speeding penalty, which happened when he knocked the limiter off while removing a visor tear-off. He doesn't reckon today was his day, though.

"Maybe I would've finished a place better if I hadn't made the mistake, but that's all we had. We weren't quick enough in traffic."

19:32 Aspiring IndyCar driver Jack Harvey was suitably impressed by today's race:

"Wooooow that race was awesome!!!! #indy500 incredible racing, would love to be apart of it one day #trueracing."

19:37 Indianapolis 500: Impressive showing by Busch to finish sixth. We're guessing he's already on his way to Charlotte for 600 miles of NASCAR action...

19:43 The benchmark for the Indy/Charlotte double is Tony Stewart's 2001 performance.

He took sixth with Ganassi at Indy - which Busch has just matched...

...then came third at Charlotte despite a spin.

Busch has to start at the back for the Cup race as he will miss the drivers' briefing.

19:45 Keep an eye on the news section for full reports from both Indianapolis and Charlotte later, along with plenty of reaction and follow-up through the week both online and in print.

AUTOSPORT Race Centre Live returns next weekend for an epic two days of action headlined by MotoGP at Mugello, an IndyCar double-header on the Detroit streets, and the Le Mans test day.

Here's the final Indy 500 results rundown:

1 Ryan Hunter-Reay
2 Helio Castroneves
3 Marco Andretti
4 Carlos Munoz
5 Juan Pablo Montoya
6 Kurt Busch
7 Sebastien Bourdais
8 Will Power
9 Sage Karam
10 JR Hildebrand
11 Oriol Servia
12 Simon Pagenaud
13 Alex Tagliani
14 Jacques Villeneuve
15 Sebastian Saavedra
16 James Davison
17 Carlos Huertas
18 Ryan Briscoe
19 Takuma Sato
20 Jack Hawksworth
21 Mikhail Aleshin
22 Justin Wilson
23 Martin Plowman
24 Pippa Mann

Townsend Bell
Tony Kanaan
Ed Caroenter
James Hinchcliffe
Scott Dixon
Josef Newgarden
Charlie Kimball
Buddy Lazier
Graham Rahal

Ryan Hunter-Reay wins Indianapolis 500 2014

Sunday 25 May Start GMT
 Indianapolis 500 15:30