Riviera Country Club

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Jimmy Walker, winner of three tournaments so far this year, runs to the 14th tee in the pro-am of the Northern Trust Open golf tournament at Riviera Country Club in the Pacific Palisades area of Los Angeles on Wednesday, Feb. 12, 2014. (AP Photo/Reed Saxon)

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Defending champion John Merrick hits from the 15th tee during the pro-am of the Northern Trust Open golf tournament at Riviera Country Club in the Pacific Palisades area of Los Angeles on Wednesday, Feb. 12, 2014. (AP Photo/Reed Saxon)

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Kevin Stadler smiles on the 13th green in the pro-am round of the Northern Trust Open golf tournament at Riviera Country Club in the Pacific Palisades area of Los Angeles on Wednesday, Feb. 12, 2014. (AP Photo/Reed Saxon)

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Fred Couples reacts to a partner's putt in the pro-am of the Northern Trust Open golf tournament at Riviera Country Club in the Pacific Palisades area of Los Angeles on Wednesday, Feb. 12, 2014. (AP Photo/Reed Saxon)

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Fred Couples watches his shot from the 14th tee in the pro-am of the Northern Trust Open golf tournament at Riviera Country Club in the Pacific Palisades area of Los Angeles on Wednesday, Feb. 12, 2014. (AP Photo/Reed Saxon)

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Phil Mickelson tees off on the fifth hole in the third round of the Northern Trust Open golf tournament at Riviera Country Club in Los Angeles Saturday, Feb. 18, 2012. (AP Photo/Reed Saxon)

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Phil Mickelson chips from the gallery to the 12th green during the second round of the Northern Trust Open golf tournament at Riviera Country Club in Los Angeles Friday, Feb. 17, 2012. (AP Photo/Reed Saxon)

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Phil Mickelson makes his approach shot to the 13th green during the second round of the Northern Trust Open golf tournament at Riviera Country Club in Los Angeles Friday, Feb. 17, 2012. (AP Photo/Reed Saxon)