Dustin Johnson prepares to tee off on 2 during the first round of the 2013 Masters Tournament at Augusta National Golf Club on April 11, 2013, in Augusta, Ga. (JON-MICHAEL SULLIVAN/STAFF)
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Dustin Johnson acknowledges the gallery after making par on the eighth green during the first round of the 2013 Masters Tournament at Augusta National Golf Club on Thursday, April 11, 2013, in Augusta, Ga. (EMILY ROSE BENNETT/STAFF)
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Dustin Johnson reacts to a putt on No. 8 during the first round of the 2013 Masters Tournament at Augusta National Golf Club on Thursday, April 11, 2013, in Augusta, Ga. (EMILY ROSE BENNETT/STAFF)
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Fred Couples, right, takes his ball from the cup as Dustin Johnson lines up a putt on No. 8 during the first round of the 2013 Masters Tournament at Augusta National Golf Club on Thursday, April 11, 2013, in Augusta, Ga. (EMILY ROSE BENNETT/STAFF)
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Dustin Johnson lines up a putt on No. 10 green during the first round of the Masters Tournament at Augusta National Golf Club on Thursday, April 11, 2013, in Augusta, Ga. (JON-MICHAEL SULLIVAN/STAFF)
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Dustin Johnson lines up a putt on No. 10 green during the first round of the Masters Tournament at Augusta National Golf Club on Thursday, April 11, 2013, in Augusta, Ga. (JON-MICHAEL SULLIVAN/STAFF)
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Dustin Johnson walks on the 17th green during the first round of the 2013 Masters Tournament at Augusta National Golf Club on Thursday, April 11, 2013, in Augusta, Ga. (ANDREW DAVIS TUCKER/STAFF)
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Dustin Johnson lines up a putt on No. 10 green during the first round of the Masters Tournament at Augusta National Golf Club on Thursday, April 11, 2013, in Augusta, Ga. (JON-MICHAEL SULLIVAN/STAFF)
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Dustin Johnson walks on the 17th green during the first round of the 2013 Masters Tournament at Augusta National Golf Club on Thursday, April 11, 2013, in Augusta, Ga. (ANDREW DAVIS TUCKER/STAFF)
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Dustin Johnson tees off on No. 2 during the first round of the 2013 Masters Tournament at Augusta National Golf Club on April 11, 2013, in Augusta, Ga. (JON-MICHAEL SULLIVAN/STAFF)
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Dustin Johnson takes a drink of water as he walks to the 15th green during the first round of the 2013 Masters Tournament at Augusta National Golf Club on Thursday, April 11, 2013, in Augusta, Ga. (EMILY ROSE BENNETT/STAFF)
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Dustin Johnson raises his putter on the 18th hole after the first round of the Masters Tournament at Augusta National Golf Club on Thursday, April 11, 2013, in Augusta, Ga. (AP Photo/Darron Cummings)
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Fred Couples, left, and Dustin Johnson shake hands after finishing on the 18th green during the first round of the 2013 Masters Tournament at Augusta National Golf Club on Thursday, April 11, 2013, in Augusta, Ga. (JEFF JANOWSKI/STAFF)
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Dustin Johnson lines up a putt on No. 13 during the first round of the 2013 Masters Tournament at Augusta National Golf Club on Thursday, April 11, 2013, in Augusta, Ga. (JON-MICHAEL SULLIVAN/STAFF)
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Dustin Johnson acknowledges the gallery after making a putt on the 13th green during the first round of the 2013 Masters Tournament at Augusta National Golf Club on Thursday, April 11, 2013, in Augusta, Ga. (JON-MICHAEL SULLIVAN/STAFF)
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Dustin Johnson acknowledges the gallery after finishing on the 18th green during the first round of the 2013 Masters Tournament at Augusta National Golf Club on Thursday, April 11, 2013, in Augusta, Ga. (ANDREW DAVIS TUCKER/STAFF)