Dustin Johnson is taking a leave of absence from golf to seek help for what he said were "personal challenges." While the statement he released through his management company offered no details, Johnson would not be at the PGA championship next week at Valhalla Golf Club and could miss the Ryder Cup. Johnson says by committing time and resources to improve his life he will be better equipped to fulfill his potential. The 30 year old Johnson is number four in the FedEx Cup. He is fifth in the Ryder Cup standings.