Will Power has broken through at Iowa Speedway, winning the second IndyCar Series race of the weekend for his first victory at the track.

The Australian star held off second-place driver Alex Palou by 0.3915 seconds, while New Zealander Scott McLaughlin, who won Saturday's race, finished third.

Power, who led for 50 laps of the 250-lap race, has always been fast at the oval — he has won seven poles here in his career — but he had only five podium finishes in 18 starts. He had finished 18th in Saturday's race after starting fourth.

It was Power's 43rd career IndyCar win, but his first on an oval since winning at Pocono in 2019.

The win completed a Team Penske sweep, after McLaughlin's victory. It was the ninth Penske win in IndyCar races at the track and the third victory for the team at the track this season, Ryan Blaney having won the NASCAR Cup Series race in June.

The 43-year-old Queenslander Power, who started 22nd on Sunday, was able to move to second on the first round of pit stops, then took the lead after his second pit stop on lap 206 that was almost nine-tenths of a second faster than Palou's.

A four-car crash occurred on the final lap as Power was taking the chequered flag. Sting Ray Robb's car flipped twice on the backstretch after clipping the car of Alexander Rossi. Kyle Kirkwood and Ed Carpenter also were collected in the crash.

Robb was taken to the infield care centre on a stretcher, but gave a thumbs-up sign as he was taken to an ambulance.