Pebble Beach - Jimmy Walker let a big lead shrink, but held on for a one-shot victory at the Pebble Beach National Pro-Am, his third win in eight US PGA Tour starts this season.
Walker carded a two-over par 74 in the final round for an 11-under par total of 276.
Two-time Pebble Beach Pro-Am winner Dustin Johnson and Jim Renner tied for second at 277, Johnson climbing up the leaderboard with a 66 and Renner carding a 77.
Walker had held a six-shot lead when the third round in the weather-disrupted tournament was wrapped up on Sunday morning.
Walker had come from behind in his prior two victories this season -- the Frys.com Open in October which was the first event of the US tour's "wrap-around" 2013-14 season and the Sony Open in January.
He acknowledged that he felt the pressure of trying to hold on to a big lead, and gave a sigh of relief after he got up and down for par at the par-five 18th to secure the win.
Jordan Spieth carded a 67 and Kevin Na a 68 to share fourth place on eight-under 279.
Hunter Mahan posted an even-par 72 for solo sixth place on 280.
Northern Ireland's Graeme McDowell, playing at Pebble Beach for the first time since he won the 2010 US Open on the iconic course overlooking the Pacific Ocean, closed with a 67 for 281. he was joined in seventh place by Pat Perez (71) and New Zealand's Tim Wilkinson (73).Leading final-round scores on Sunday in the $6.6 million Pebble Beach National Pro-Am on the par-72 Pebble Beach Golf Links, par-71 Monterey Peninsula, par-72 Spyglass Hill (USA unless noted):
276 - Jimmy Walker 66-69-67-74
277 - Dustin Johnson 68-73-70-66, Jim Renner 65-73-72-67
279 - Jordan Spieth 67-67-78-67, Kevin Na 72-68-70-69
280 - Hunter Mahan 68-68-72-72
281 - Graeme McDowell (NIR) 71-71-72-67, Pat Perez 69-70-71-71, Tim Wilkinson (NZL) 67-72-69-73
282 - Bryce Molder 72-71-69-70, Chesson Hadley 71-70-70-71, Richard H. Lee 65-72-72-73
283 - Will MacKenzie 69-74-70-70, Cameron Tringale 70-73-71-69, Patrick Reed 69-70-75-69, Victor Dubuisson (FRA) 73-67-74-69, Brian Davis (ENG) 68-74-70-71, Scott Gardiner (AUS) 65-73-77-68
284 - Steven Bowditch (AUS) 68-70-75-71, Noh Seung-Yul (KOR) 72-71-71-70, Daniel Summerhays 69-69-74-72, Jason Kokrak 74-68-70-72, Brice Garnett 75-68-68-73, Roberto Castro 70-73-71-70, Michael Thompson 71-68-72-73, Phil Mickelson 66-73-71-74
285 - Padraig Harrington (IRL) 72-69-72-72, Andrew Loupe 63-73-76-73, Russell Knox (SCO) 70-72-70-73, Jim Herman 70-70-71-74, Robert Garrigus 67-71-73-74