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Australia's Will Power has enjoyed a successful weekend at the IndyCar double-header at Iowa Speedway, despite not tasting victory.
Power finished second and third in Newton after starting on pole for both races.
Pato O'Ward pounced on Josef Newgarden's misfortune to win the second race on Sunday.
Newgarden dominated and led 148 of the 300 laps while trying to sweep the weekend. But something on his Team Penske car broke with 64 laps remaining and he spun hard into the outside wall.
He was visibly rattled after his mandatory check in the infield care centre.
"Definitely was a bit of a shot. I want to cry, so sad for my team. I don't know what happened," Newgarden said.
"Everything felt fine to me. Totally unexpected and it caught me by my surprise. Team Penske is the best. I never have this stuff, so maybe we were due.
"But we'll fight back. We have a great team here."
O'Ward actually made the pass for the win on pit road with a speedy stop by his Arrow McLaren SP team and held off Penske teammates Power and former Kiwi Supercars star Scott McLaughlin for the win. It's the second win of the season for Mexican driver O'Ward, who finished second on Saturday and remains firmly in the IndyCar title race with five races remaining.
O'Ward's win also halted Team Penske's dominance on the 0.894-mile oval, where Roger Penske's drivers had won six of the last seven races prior to Sunday.
It was another podium sweep for Chevrolet, who did it on Saturday with Newgarden, O'Ward and Power.
Newgarden was scored as the points leader at the time of his crash and dropped to fourth in the standings following his crash.
IndyCar and NASCAR share next weekend at Indianapolis Motor Speedway. IndyCar races Saturday on the road course while NASCAR races Sunday.