The Associated Press

INDIANAPOLIS - Al Unser might be the only person who understands what Helio Castroneves has endured this month.

In 1972, Unser was in the spotlight. He was the fan favorite and the media darling and was questioned endlessly about his quest for an unprecedented third straight Indianapolis 500 win.

That was the last time anybody had a chance, until this year. Castroneves will race for history Sunday, and Unser offers some simple advice: Don't change a thing.

"I didn't think about it, I just wanted to win," said Unser.

Only five drivers have been in this position: Wilbur Shaw in 1941, Mauri Rose in 1949, Bill Vukovich in 1955, Unser and Castroneves.

Shaw finished 18th in his bid, and Rose was 13th. Vukovich was leading after 56 laps when he was killed in a crash. Unser just missed becoming the first to win three straight, placing second in 1972.

Castroneves won Indy as a rookie and in his second start. He won the pole for his third start.

With so much success, it would be easy for Castroneves to get caught up in the hype. But the Brazilian is relishing the moment.

"The only thing I keep thinking about is how many drivers would like to be in my shoes," Castroneves said. "I'm enjoying every single moment of this."

A win Sunday would keep Castroneves unbeaten at America's best-known track.

"This place has been magical for me," he said.

If the magic is to continue, Unser knows what Castroneves must do: Forget about the record. Just worry about winning one more race.

"It isn't about winning three in a row," Unser said. "It's about just winning."