Paul Casey Withdraws

For a second straight week, Paul Casey withdrew because of a rib injury.

CHASKA, Minn. (AP) -- Paul Casey of England, the world's No. 3 player, withdrew from the PGA Championship because of a rib injury.

Casey, a three-time winner this year on the PGA and European tours, first injured strained the rib muscle a week before the British Open. He has tried to let it heal with rest and treatment, but had to withdraw early in the first round a week ago at Firestone.

Casey said after withdrawing Thursday that he feels fine when he's taking easy swings. But he can still feel it pull on longer iron shots.

"If it is doing that on a flat lie on the range, then I can't risk it on the golf course," he said. "It seems like there has been a lot of guys who have had similar issues in the past, and the advice I have been given from the experts and a lot of the players is don't push it too quickly."

He planned to return to Phoenix later Thursday and have tests done to make sure the injury really is a pulled muscle and not something more serious, like a cracked rib.

"I don't think it is that," he said, "but we have to get it checked just to make sure."

Casey, who withdrew about an hour before his tee time, was replaced in the field by Tim Petrovic. Meanwhile, alternates Jason Day and George McNeill decided not to come to Hazeltine National. With Casey withdrawing and being replaced by Petrovic, Tim Herron, who grew up 15 minutes away in Wayzata, became the first alternate. Herron, the only PGA Tour player who lives in Minnesota, did not qualify and was not given an invitation. His ranking is 222nd.

Casey was the third player to withdraw at Hazeltine, leaving 97 of the top 100 players in the world at the final major. Robert Karlsson and Trevor Immelman previously withdrew.