The victory moved Mahan to No. 4 in the world ranking , the first time he 's ever been the highest - ranked American .
Mahan , the Match Play Championship winner in February , finished at 16 under at Redstone .
The victory moved winner to No. 4 in the world ranking , the first time Mahan 's ever been the highest - ranked American .
Mahan , the Match Play Championship winner in February , finished at 16 under at Redstone .