Keegan Bradley, who last won a major at the 2011 PGA Championship, has issued a telling warning to his fellow Americans who sit atop the PGA Tour rankings.

Former University of North Florida standout Philip Knowles will benefit from the withdrawal of Xander Schauffele from the PGA Tour's American Express.

Xander Schauffele, the world's number two ranked player, surprisingly withdrew from The American Express on Monday.