'I want to punch you': Irate Romain Grosjean explodes at Kiwi Marcus Armstrong at Indianapolis Grand Prix

Controversial IndyCar driver Romain Grosjean is in the news again as video emerged of him angrily confronting New Zealand's Marcus Armstrong in pit lane at the Indianapolis Grand Prix.

It was unclear exactly what the veteran Frenchman was upset about.

No stranger to blow-ups, Grosjean finished 21st after being caught up in a late multi-car crash while Armstrong wound up 11th.

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Ex-Formula 1 driver Grosjean had to be restrained by Armstrong's crew as he got in his face.

Video surfaced post-race of Grosjean, 40, approaching Armstrong, 25, in the pit lane before being stopped by the New Zealander's crew.

"Get off. I was going to talk to him," Grosjean fumed.

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"I was going to say I want to punch you. I'll put my hands behind my back."

Things eventually calmed down and Armstrong laughed off the brouhaha on Stan Sport's coverage.

"He fancied a bit of a fist fight, actually – bit of UFC, bit of MMA – something I'm not accustomed to," Armstrong said.

"Hey, I've got a 350 pound fueller who was right behind me. So fair play to Romain, he's got some balls for trying to attack me with him behind me.

"I almost said on the radio, cue the pit lane brawl. Actually, we've always discussed it, imagine a brawl on pit lane. How would we stack up? And I think we'd stack up pretty well."

Denmark's Christian Lundgaard won the race.

He waited for the perfect moment to set up a daring outside move with 18 laps to go, then nudged his way past David Malukas through three sweeping turns on Indianapolis Motor Speedway's road course and sped away from the field.

Now he's going to find out if it helps him in the Indianapolis 500.

Lundgaard snapped a 47-race winless streak, beating Malukas to the yard of bricks by 4.763 seconds for the second win of his career and first in nearly three years.

It gives the Arrow McLaren team a boost of confidence heading into IndyCar's biggest race of the season.

"At the end of the day, I had nothing to lose," Lundgaard said.

"I had so much unfinished business here. For me, it wasn't that I wanted to win. I have enough second places in the past year and a half, I wanted to win and I was kind of willing to do whatever it took."

Lundgaard drove like it, though he won't be celebrating long with the Indy 500 looming.

While success on Indy's 14-turn road course doesn't usually translate into success on the Brickyard's more famous oval, Lundgaard thinks this win helped him turn the corner.

"I know I can beat anyone and I'm sure 95 per cent of the field will say the same thing," he said.

"To finally get it, I think we've come close many, many times, and I think we've unlocked the door now and am pretty confident there will be many more."

Four-time series champ Alex Palou knows exactly what it takes to pull off the May sweep.

The Spaniard won both Indy races last year.

And despite failing to join seven-time world champ Michael Schumacher as the only drivers in Brickyard history to win the same event four consecutive years, he still managed to extend his points lead over Kyle Kirkwood to 27 points.

Schumacher won F1's US Grand Prix each year from 2003-06.

Australia's Will Power finished 13th in Indianapolis.