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Northern Trust Open - Round One

PACIFIC PALISADES, CA - FEBRUARY 16: Charles Howell III hits a second shot on the fifth hole during the first round of the Northern Trust Open at the Riviera Country Club on February 16, 2012 in Pacific Palisades, California. (Photo by Harry How/Getty Images)

Haas clinches Riviera 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.