Tempers flared all around the streets of Long Beach, where drivers declared friendships over after a surprisingly physical race.
Simon Pagenaud refused to accept a post-race apology from Will Power, and Justin Wilson was furious with Scott Dixon. James Hinchcliffe tried to be diplomatic but failed to hide his displeasure with Andretti Autosport teammate Ryan Hunter-Reay.
The one team smiling at the end of Sunday's race? Ed Carpenter Racing, which got an unexpected victory from Mike Conway.
Conway, hired this year when team owner and oval specialist Carpenter decided to get out of the car on road and street courses, started 17th and overcame an early broken wing to win the Toyota Grand Prix for the second time in his career. The British driver was chasing Dixon over the final few laps, then got the lead when Dixon stopped for fuel two laps from the finish.
"I didn't know whether he had the fuel to finish or not," Conway said. "Second would have been good, but this is awesome."
The race was shaping up to be a Hunter-Reay rout until he triggered a seven-car accident 24 laps from the finish. Hunter-Reay tried to pass Josef Newgarden as they entered a tight Turn 4. The two cars collided, and Hinchcliffe ran into the back of Newgarden.
"At the end of the day, patience is a virtue and someone wasn't very virtuous today. It was a rookie move," Hinchcliffe said.
Hunter-Reay didn't exactly accept responsibility.
"I went for it. I could have waited a little bit later, maybe that's my fault," he said.
The accident opened the door for Dixon to score his first career win at Long Beach, until he stopped for fuel as a precaution.
He had to mend fences with Wilson, who was enraged over contact with Dixon "that is so deliberate and blatant" and angry that IndyCar did not penalize Dixon.
Pagenaud was furious with Power, refusing to accept his apology, and angry that IndyCar did not penalize Power for contact between the two.
"I think we had a car to win and he pretty much ruined our race, our chance," Pagenaud said. "We were friends until now. We won't be going on vacation together, I guess."
NHRA: Robert Hight became the first two-time Funny Car winner in the NHRA Four-Wide Nationals, beating John Force, Alexis DeJoria and Tim Wilkerson in the final in Concord, N.C.
Antron Brown won the Top Fuel division, Jimmy Alund topped the Pro Stock field to become the first European winner in the Mello Yello Drag Racing Series, and Andrew Hines won in Pro Stock Motorcycle in the event that features racing in four lanes instead of the traditional two.
Hight extended his lead to 53 points over Force.
MotoGP: Marc Marquez, the reigning MotoGP world champion, cruised to his second win of the season, defending his title in the Grand Prix of the Americas in Austin, Texas.
Marquez had a nearly 3-second lead midway through the race and was never challenged. Dani Pedrosa, Marquez's Repsol Honda teammate and countryman, finished second for the second straight year and was more than 4 seconds behind.
Racing fatality: The Italian motorcycling federation says rider Emanuele Cassani has died after being involved in a crash at the Coppa Italia season opener in Misano Adriatico, Italy. Cassani, 25, skidded and was hit by two other riders shortly after the start of his race.