Dustin Johnson signs autographs after a practice round at the PGA Championship golf tournament at the Quail Hollow Club Thursday, April 13, 2017, in Charlotte, N.C. (AP Photo/John Bazemore)
Jordan Spieth watches as Dustin Johnson lines up a putt on the 15th hole during a practice round at the PGA Championship golf tournament at the Quail Hollow Club Tuesday, Aug. 8, 2017, in Charlotte, N.C. (AP Photo/Chris Carlson)
Dustin Johnson watches his tee shot on the 17th hole during a practice round at the PGA Championship golf tournament at the Quail Hollow Club Tuesday, Aug. 8, 2017, in Charlotte, N.C. (AP Photo/Chris Carlson)
Dustin Johnson watches hit tee shot on the 16th hole during a practice round at the PGA Championship golf tournament at the Quail Hollow Club Tuesday, Aug. 8, 2017, in Charlotte, N.C. (AP Photo/Chris Carlson)
Dustin Johnson speaks during a news conference at the PGA Championship golf tournament at the Quail Hollow Club Tuesday, Aug. 8, 2017, in Charlotte, N.C. (AP Photo/Chris Carlson)
Dustin Johnson speaks during a news conference at the PGA Championship golf tournament at the Quail Hollow Club Tuesday, Aug. 8, 2017, in Charlotte, N.C. (AP Photo/Chris Carlson)
Dustin Johnson speaks during a news conference at the PGA Championship golf tournament at the Quail Hollow Club Tuesday, Aug. 8, 2017, in Charlotte, N.C. (AP Photo/Chris Carlson)
Dustin Johnson waits to putt on the 18th hole during the second round of the U.S. Open golf tournament Friday, June 16, 2017, at Erin Hills in Erin, Wis. (AP Photo/David J. Phillip)
Dustin Johnson walks to the 18th green during the second round of the U.S. Open golf tournament Friday, June 16, 2017, at Erin Hills in Erin, Wis. (AP Photo/David J. Phillip)
Dustin Johnson wipes his head as he walks off the 18th green during the second round of the U.S. Open golf tournament Friday, June 16, 2017, at Erin Hills in Erin, Wis. (AP Photo/Chris Carlson)
Dustin Johnson wipes his head as he walks off the 18th green during the second round of the U.S. Open golf tournament Friday, June 16, 2017, at Erin Hills in Erin, Wis. (AP Photo/David J. Phillip)
Dustin Johnson drives on the 18th hole during the second round of the U.S. Open golf tournament Friday, June 16, 2017, at Erin Hills in Erin, Wis. (AP Photo/Charlie Riedel)
The last two U.S. Open champions, Dustin Johnson, left, and Jordan Spieth talk on the 10th green during the first round of the U.S. Open golf tournament, Thursday, June 15, 2017, at Erin Hills in Erin, Wis. (John Ehlke/West Bend Daily News via AP)
Dustin Johnson reacts to a shot on the 10th hole during the first round of the U.S. Open golf tournament Thursday, June 15, 2017, at Erin Hills in Erin, Wis. (AP Photo/Chris Carlson)
Dustin Johnson hits on the 13th hole during the first round of the U.S. Open golf tournament Thursday, June 15, 2017, at Erin Hills in Erin, Wis. (AP Photo/Chris Carlson)
Dustin Johnson hits out of the fescue on the 17th hole during the first round of the U.S. Open golf tournament Thursday, June 15, 2017, at Erin Hills in Erin, Wis. (AP Photo/David J. Phillip)
Dustin Johnson hits out of the fescue on the 17th hole during the first round of the U.S. Open golf tournament Thursday, June 15, 2017, at Erin Hills in Erin, Wis. (AP Photo/David J. Phillip)
Dustin Johnson hits from the fescue on the 12th hole during the first round of the U.S. Open golf tournament Thursday, June 15, 2017, at Erin Hills in Erin, Wis. (AP Photo/Chris Carlson)
Dustin Johnson hits on the range during a practice day for the U.S. Open golf tournament Wednesday, June 14, 2017, at Erin Hills in Erin, Wis. (AP Photo/Morry Gash)