K.J. Choi of South Korea tees off on the 12th hole during the second round of the AT&T National golf tournament at Aronimink Golf Club, Friday, July 1, 2011, in Newtown Square, Pa.

K.J. Choi of South Korea tees off on the 12th hole during the second round of the AT&T National golf tournament at Aronimink Golf Club, Friday, July 1, 2011, in Newtown Square, Pa.