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Northern Trust Open - Round Three

PACIFIC PALISADES, CA - FEBRUARY 18: Phil Mickelson lines up his putt on the second hole during the third round of the Northern Trust Open at the Riviera Country Club on February 18, 2012 in Pacific Palisades, California. (Photo by Harry How/Getty Images)

Haas clinches Riviera win in sudden-death playoff

Bill Haas clinched his fourth PGA Tour title by beating fellow Americans Phil Mickelson and Keegan Bradley in a gripping sudden-death playoff for the Northern Trust Open Sunday.