USA's Jason Dufner reacts after making a birdie putt on the 13th hole during a singles match at the Ryder Cup PGA golf tournament Sunday, Sept. 30, 2012, at the Medinah Country Club in Medinah, Ill. (AP Photo/Charles Rex Arbogast)

Associated Press
USA's Jason Dufner reacts after making a birdie putt on the 13th hole during a singles match at the Ryder Cup PGA golf tournament Sunday, Sept. 30, 2012, at the Medinah Country Club in Medinah, Ill. (AP Photo/Charles Rex Arbogast)
USA's Jason Dufner reacts after making a birdie putt on the 13th hole during a singles match at the Ryder Cup PGA golf tournament Sunday, Sept. 30, 2012, at the Medinah Country Club in Medinah, Ill. (AP Photo/Charles Rex Arbogast)
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