Louis Oosthuizen and Michael Bradley, who were 3 under and 2 under, respectively, withdrew before Sunday's final round of the Byron Nelson Championship due to injuries.
Oosthuizen, the highest-ranked player in the field and the 2010 British Open champ, cited a neck problem; Bradley had a back issue.
Oosthuizen entered the tournament as the world's No. 7-ranked player. He was at 3-under 207 and tied for 32nd place.
At 13 under entering the final round, Keegan Bradley was the wire-to-wire leader at the TPC Four Seasons Resort in Irving, Texas. Click here for the updated leaderboard.
Oosthuizen is expected to play in next week's Colonial, while Bradley is not a listed participant, the Associated Press reported.