Dustin Johnson

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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)

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Dustin Johnson hits from some tall fescue on the 12th hole during a practice round for the U.S. Open golf tournament Wednesday, June 14, 2017, at Erin Hills in Erin, Wis. (AP Photo/David J. Phillip)

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Dustin Johnson hits a drive on the 12th hole during a practice round for the U.S. Open golf tournament Wednesday, June 14, 2017, at Erin Hills in Erin, Wis. (AP Photo/David J. Phillip)

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Dustin Johnson putts on the 11th green during the first round of The Players Championship golf tournament Thursday, May 11, 2017, in Ponte Vedra Beach, Fla. (AP Photo/Chris O'Meara)

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Dustin Johnson hits from the second tee during the first round of The Players Championship golf tournament Thursday, May 11, 2017, in Ponte Vedra Beach, Fla. (AP Photo/Lynne Sladky)

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Dustin Johnson chips onto the seventh green during a practice round for The Players Championship golf tournament Wednesday, May 10, 2017, in Ponte Vedra Beach, Fla. (AP Photo/Chris O'Meara)

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Dustin Johnson warms up on the driving range during practice rounds at the Wells Fargo Championship at Eagle Point golf course on Tuesday May 2, 2017 in Wilmington, N.C. (Ken Blevins/StarNews via AP)

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Dustin Johnson talks with media after deciding not to play in the opening round of the Masters golf tournament at the Augusta National Golf Club in Augusta, Ga., Thursday, April 6, 2017. The world's No. 1-ranked player was, however, forced to withdraw from the Masters on Thursday because of a lower back injury suffered less than 24 hours earlier in a freak fall at the home he was renting for the week. (Brant Sanderlin/Atlanta Journal-Constitution via AP)

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Dustin Johnson walks off the 1st tee after deciding not to play in the opening round of the Masters golf tournament at the Augusta National Golf Club in Augusta, Ga., Thursday, April 6, 2017. The world's No. 1-ranked player was, however, forced to withdraw from the Masters on Thursday because of a lower back injury suffered less than 24 hours earlier in a freak fall at the home he was renting for the week. (Brant Sanderlin/Atlanta Journal-Constitution via AP)

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Dustin Johnson heads into the clubhouse after deciding not to play in the opening round of the Masters golf tournament at the Augusta National Golf Club in Augusta, Ga., Thursday, April 6, 2017. The world's No. 1-ranked player was, however, forced to withdraw from the Masters on Thursday because of a lower back injury suffered less than 24 hours earlier in a freak fall at the home he was renting for the week. (Brant Sanderlin/Atlanta Journal-Constitution via AP)

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Dustin Johnson walks off the 1st tee after deciding not to play in the opening round of the Masters golf tournament at the Augusta National Golf Club in Augusta, Ga., Thursday, April 6, 2017. The world's No. 1-ranked player was, however, forced to withdraw from the Masters on Thursday because of a lower back injury suffered less than 24 hours earlier in a freak fall at the home he was renting for the week. (Brant Sanderlin/Atlanta Journal-Constitution via AP)

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Dustin Johnson hits from a bunker on the 10th hole during a practice round for the Masters golf tournament Wednesday, April 5, 2017, in Augusta, Ga. (AP Photo/Charlie Riedel)

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Dustin Johnson hits to the 11th hole during a practice round for the Masters golf tournament Wednesday, April 5, 2017, in Augusta, Ga. (AP Photo/Charlie Riedel)

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Dustin Johnson and Brooks Koepka walk on the 13th hole during a practice round for the Masters golf tournament Wednesday, April 5, 2017, in Augusta, Ga. (AP Photo/Charlie Riedel)

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Dustin Johnson hits from a bunker on the 10th hole during a practice round for the Masters golf tournament Wednesday, April 5, 2017, in Augusta, Ga. (AP Photo/Charlie Riedel)

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Dustin Johnson hits on the 13th hole during a practice round for the Masters golf tournament Wednesday, April 5, 2017, in Augusta, Ga. (AP Photo/Matt Slocum)

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Dustin Johnson hits out of a bunker on the second hole during a practice round for the Masters golf tournament Tuesday, April 4, 2017, in Augusta, Ga. (AP Photo/Matt Slocum)

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Dustin Johnson hits from a bunker to the second green during a practice round at the Masters golf tournament, Tuesday, April 4, 2017, in Augusta, Ga. (Curtis Compton/Atlanta Journal-Constitution via AP)

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Dustin Johnson hits his tee shot on the third hole during a practice round for the Masters golf tournament Tuesday, April 4, 2017, in Augusta, Ga. (AP Photo/Matt Slocum)

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Dustin Johnson hits on the driving range during practice for the Masters golf tournament Tuesday, April 4, 2017, in Augusta, Ga. (AP Photo/Matt Slocum)