NEWTOWN SQUARE, Pa. -- Chris Couch just withdrew from the AT&T National, citing a lower back injury.

Couch, who opened with a 73, played nine holes Friday before pulling out. He was 7 over with six bogeys, one double bogey and a birdie.

Earlier in the day, Boo Wekley withdrew due to a rib injury. He pulled out before his round started. Weekley shot 75 in the first round.