INDIANAPOLIS — Will Power lost three consecutive championships before he decided a change was in order.

He knew he must improve on oval tracks to be considered among the best in racing.

If there was any doubt how serious Power was about his turnaround, he settled it Sunday by winning on the biggest oval of them all.

Power won the Indianapolis 500 to check off one of the few empty boxes on his resume. When he stopped hating ovals, he won the 2014 IndyCar championship. When he started to appreciate Indianapolis Motor Speedway and made it a priority, he finally figured out how to win there.

Power gave team owner Roger Penske a 17th Indy 500 victory in a sweep of the “month of May” at Indianapolis. Power also won on the road course two weeks ago and Sunday’s win was his 34th, tying him with Al Unser Jr. for eighth on IndyCar’s all-time list.