Injured Casey withdraws from PGA Championship

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 (AP) -- Paul Casey of England, the world's No. 3 player, has withdrawn from the PGA Championship because of a rib injury.

Casey, a three-time winner this year on the PGA TOUR (one win) and European Tour (two wins), first 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 the World Golf Championships-Bridgestone Invitational.

He decided not to play Thursday morning. Casey was replaced by Tim Petrovic, who was headed to the 10th tee to start his round.

Casey is the third player to withdraw at Hazeltine, leaving 97 of the top 100 players in the Official World Golf Ranking at the final major. Robert Karlsson and Trevor Immelman previously withdrew.