Dustin Johnson

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Dustin Johnson watches his shot on the ninth hole during a practice round of the Cadillac Championship golf tournament, Wednesday, March 5, 2014 in Doral, Fla. (AP Photo/Wilfredo Lee)

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Dustin Johnson watches his drive on the second tee in the final round of the Northern Trust Open golf tournament at Riviera Country Club in the Pacific Palisades area of Los Angeles, Sunday, Feb. 16, 2014. (AP Photo/Reed Saxon)

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Dustin Johnson watches his birdie putt go into the hole on the first green in the final round of the Northern Trust Open golf tournament at Riviera Country Club in the Pacific Palisades area of Los Angeles, Sunday, Feb. 16, 2014. (AP Photo/Reed Saxon)

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Dustin Johnson chips to the fourth green in the second round of the Northern Trust Open golf tournament at Riviera Country Club in the Pacific Palisades area of Los Angeles, Friday, Feb. 14, 2014. (AP Photo/Reed Saxon)

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Dustin Johnson makes his approach shot on the ninth fairway in the second round of the Northern Trust Open golf tournament at Riviera Country Club in the Pacific Palisades area of Los Angeles, Friday, Feb. 14, 2014. (AP Photo/Reed Saxon)

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Dustin Johnson, right, is greeted by playing partner Wayne Gretzky, left, on the 18th green of the Pebble Beach Golf Links during the final round of the AT&T Pebble Beach Pro-Am golf tournament Sunday, Feb. 9, 2014, in Pebble Beach, Calif. Johnson finished tied for second place after shooting a 6-under-par 66 to finish at total 10-under-par. (AP Photo/Eric Risberg)

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Dustin Johnson putts on the 18th green of the Pebble Beach Golf Links during the final round of the AT&T Pebble Beach Pro-Am golf tournament Sunday, Feb. 9, 2014, in Pebble Beach, Calif. Johnson finished tied for second place after shooting a 6-under-par 66 to finish at total 10-under-par. (AP Photo/Eric Risberg)