2014 PGA Championship: WDs at Valhalla

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Victims of ValhallaWe're only two days into the PGA Championship at Valhalla, and six golfers have already called it quits. What's going on down here?
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Matt KucharPlagued by back spasms, Kuchar was the first to withdraw from the tournment, electing not to start his 9:05 a.m. first-round tee time.
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Jason DufnerReigning PGA Champ Dufner had been suffering from two bulging disks in his neck since April. He withdrew after making a triple-bogey 8 on the 10th hole, and later said it would have been "pointless" for him to continue..
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Ben CraneCrane withdrew with a back injury before teeing off for Friday's second round.
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Kiradech AphibarnratThailand's Aphibarnrat withdrew after just eight holes in Friday's second round, citing a knee injury.
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Boo WeekleyAfter completing eight holes on Friday, Weekley withdrew from Valhalla due to a shoulder injury.
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Angel CabreraCabrera is the most recent player to withdraw from the PGA Championship, blaming a shoulder injury for his exit after 12 holes on Friday.