James Hahn birdied the third playoff hole on Sunday to win the Northern Trust Open.
Hahn, Dustin Johnson and Paul Casey all finished at 6-under-par 278. Hahn and Johnson, who played together in the final round, carded 2-under 69s, while Casey shot 3-under 68 to get into the playoff.
The group returned to the 18th at Riviera Country Club for the first playoff hole. Hahn and Johnson found the green with their approach shots, while Casey came up short with his second. After Casey chipped to three feet, Hahn and Johnson 2-putted for their pars. Casey kicked in his par and they were off to the short, but difficult par-4 10th.
Johnson and Hahn found the left rough off the tee and Casey's tee ball landed in the short grass. Casey chipped to about 15 feet. Hahn and Johnson both hit stellar chip shots, Hahn to 12 feet and Johnson to four feet.
Casey's birdie effort slid by the hole and he marked. Hahn drained his birdie putt, and Johnson dropped his birdie try in as well. Casey was eliminated, while Hahn and Johnson moved to the par-3 14th.
Johnson dropped his tee shot 11 feet from the hole. Hahn followed by hitting his tee ball to 17 feet. Hahn poured in his birdie putt.
Johnson's birdie effort missed on the left side to give Hahn his first PGA Tour victory.
Last year's winner Bubba Watson tripped to a 2-over 73 and fell into a share of 14th at 2-under-par 282 ... The PGA Tour kicks off the Florida swing next week with The Honda Classic, where Russell Henley will defend his title against a field that includes world No. 1 Rory McIlroy.