Dustin Johnson holds a four-shot advantage going into the final round at the Pebble Beach National Pro-Am after a five-under-par 67 at Poppy Hills saw him climb to the top of the leaderboard.
Johnson was two strokes off the pace entering the third round but managed to overhaul Retief Goosen, who shot a 74 at Spyglass Hill to relinquish the lead.
Birdies on four of his last nine holes moved Johnson to 15-under, while Canadian Mike Weir signed for a 69 at Spyglass Hill to move into second on 11 under par.
Goosen, a double US Open champion, is third at 10-under as the South African looks for his first PGA Tour title in more than three years.
Currently in just his second full year on the PGA Tour, Johnson is looking for the second victory of his career in an event which is being played at Pebble Beach Golf Links, Spyglass Hill Golf Course and Poppy Hills Golf Club.
Heavy rain and strong winds are expected for the final round, which will be played at the Pebble Beach Golf Links.
Despite the ominous forecast, Johnson has no plans to alter his strategy.
"I'm not going to change my game plan at all," Johnson said.
"Obviously everyone is going to be playing in the same weather, so if it's difficult for me, it's difficult for everyone."
Johnson was thankful his touch around the greens made up for some wayward approach shots.
"I got off to kind of a little bit of a rough start. I hit a few bad shots, but my short game was very good, so I chipped it close and made the putts. So that kept me going a little bit," he said.
"I birdied all the par-fives. Out there you've just got to take advantage of the par-fives and usually you're going to play pretty well."
Goosen was naturally disappointed with his day's efforts.
"It was a terrible round of golf. I played poorly tee to green," he said.
"It was a very disappointing round, I've played myself a little bit out of the tournament now. I'm going to need a very low round to have a chance of catching the leader now. I wasn't very comfortable out there at all today, couldn't hit the ball well and struggled, really."
Weir, meanwhile, is hoping his wealth of experience will give him the edge.
"I have some good memories to draw on. I've played some good rounds at Pebble Beach, and as far as the weather goes, we'll see what we get tomorrow," Weir said.
"This week we've been lucky. Most days they've called for a lot of rain and we've got away with it. So who knows.
"If it's calm at Pebble Beach you can score. If it's windy it's as tough as anything. We'll see what we get."
Collated third round scores & totals in the USPGA Tour AT&T Pebble Beach National Pro-Am, Pebble Beach GC, Poppy Hills GC, Spyglass Hill GC, Pebble Beach, California, United States of America
(USA unless stated, par 72):
Pebble Beach GC
208 Kevin Chappell 68 72 68
210 Charley Hoffman 66 70 74
211 Tim Herron 72 68 71, Tim Clark (Rsa) 71 71 69
212 Jim Furyk 71 70 71
213 Michael Letzig 69 73 71, Pat Perez 73 71 69, Robert Garrigus 65 71 77, Glen Day 73 70 70, Charles Howell III 72 70 71
214 Phil Mickelson 72 71 71, Mathew Goggin (Aus) 70 73 71
215 Matt Weibring 70 70 75
-------------The following players failed to make the cut-------------------------
216 Tom Scherrer 68 74 74, Kevin Streelman 70 75 71, Webb Simpson 71 74 71, Fred Couples 73 70 73, Fredrik Jacobson (Swe) 68 73 75, Ken Duke 71 72 73, Brandt Snedeker 71 71 74, Corey Pavin 74 70 72, Jason Gore 75 69 72, Ryan Moore 72 67 77
217 Brian Davis (Eng) 72 71 74, Will MacKenzie 70 69 78, Parker McLachlin 76 73 68, Steve Elkington (Aus) 67 75 75, Jesper Parnevik (Swe) 73 71 73
218 Jeff Maggert 69 72 77, Paul Stankowski 74 71 73, Bo Van Pelt 70 73 75
219 Joe Durant 73 73 73, Kirk Triplett 71 78 70, Scott Sterling 77 72 70, Ryan Palmer 74 73 72, Chris DiMarco 70 74 75, Tim Petrovic 72 72 75, Bryce Molder 76 68 75
220 Chris Riley 75 70 75, Brett Quigley 72 72 76, Marco Dawson 76 70 74
221 Brad Faxon 72 73 76, Kent Jones 72 74 75, Clint Jensen 76 69 76, Kevin Sutherland 74 72 75, Tommy Gainey 71 74 76
222 Gary Woodland 71 72 79
223 Garrett Willis 75 76 72, Steve Allan (Aus) 73 70 80, Nicholas Thompson 73 75 75
224 Patrick Sheehan 77 74 73, Notah Begay III 76 70 78, Skip Kendall 75 73 76
225 Scott McCarron 74 77 74
226 Kyle Thompson 78 71 77, Greg Kraft 74 72 80, Tommy Armour III 76 78 72
227 D.A. Points 73 79 75
228 Dicky Pride 77 77 74
229 Jay Delsing 79 75 75
Poppy Hills GC
201 Dustin Johnson 65 69 67
208 Bill Lunde 67 70 71, D.J. Trahan 67 73 68
209 Mark Brooks 68 69 72, Shigeki Maruyama (Jpn) 69 73 67
210 Charlie Wi (Kor) 68 69 73, Spencer Levin 71 70 69, Vaughn Taylor 66 75 69, Ted Purdy 68 72 70, Matt Kuchar 71 71 68, Jason Day (Aus) 67 75 68
211 Y. E Yang (Kor) 69 70 72, Michael Allen 67 71 73, Jeff Overton 69 70 72, Jeff Quinney 68 73 70, Davis Love III 69 72 70, Len Mattiace 69 72 70
212 Arjun Atwal (Ind) 68 73 71, Steve Lowery 70 69 73, John Mallinger 72 71 69
213 Charles Warren 74 69 70, Scott Gutschewski 71 72 70, David Mathis 71 75 67, Rich Beem 66 7572, Troy Matteson 73 71 69, Greg Owen (Eng) 68 73 72
214 Brendon De Jonge 69 74 71, Brad Adamonis 71 72 71, KJ Choi (Kor) 69 75 70, Jason Dufner 75 68 71, Chris Smith 70 75 69, David Duval 73 72 69
215 Ricky Barnes 69 75 71, Chris Kirk 73 73 69, Hunter Mahan 72 71 72, Jarrod Lyle (Aus) 72 73 70, Eric Axley 72 72 71, Bob Heintz 71 69 75
-------------The following players failed to make the cut-------------------------
216 Jonathan Kaye 69 73 74, Paul Goydos 68 77 71
217 Leif Olson 75 74 68, Joe Ogilvie 71 74 72, Lee Janzen 71 73 73
218 Kris Blanks 76 72 70, Steve Flesch 72 72 74, Wil Collins 74 74 70
219 David Toms 74 75 70
220 Casey Wittenberg 72 72 76, Tyler Aldridge 70 76 74
221 Craig Barlow 73 70 78, Brian Bateman 71 74 76
222 Michael Thompson 72 75 75, Bobby Clampett 75 76 71
223 Matthew Borchert 72 74 77, Johnson Wagner 73 76 74
224 Aaron Watkins 73 75 76, John Huston 70 76 78
225 Zack Miller 69 79 77, J.P. Hayes 72 76 77
247 Robert Floyd 80 80 87
Spyglass Hill GC
205 Mike Weir (Can) 67 69 69
206 Retief Goosen (Rsa) 68 64 74
207 Bob Estes 68 72 67, Mark Calcavecchia 67 69 71
208 Chris Stroud 69 69 70
209 Kenny Perry 71 70 68, Sean O'Hair 71 68 70
210 Kevin Stadler 71 71 68
211 Nick Watney 75 69 67, Richard S Johnson (Swe) 71 70 70, Derek Fathauer 71 71 69
212 Jeff Klauk 73 72 67, Aron Price (Aus) 68 69 75
213 Peter Tomasulo 71 70 72, Jay Williamson 70 75 68, Mark Wilson 70 73 70, Frank Lickliter II 72 71 70, James Oh (Kor) 73 72 68
214 J.B. Holmes 74 68 72, J J Henry 71 72 71, Marc Leishman (Aus) 72 73 69, Jimmy Walker 71 73 70, Rick Price 70 72 72, Matthew Jones (Aus) 71 71 72
215 Brian Vranesh 68 74 73, Dean Wilson 68 71 76, John Ellis 69 74 72, Todd Fischer 72 69 74, James Driscoll 73 70 72
-------------The following players failed to make the cut-------------------------
216 Omar Uresti 71 72 73, Jonathan Byrd 71 74 71
217 Billy Andrade 74 72 71, Joel Sjoholm (Swe) 70 76 71, Greg Chalmers (Aus) 71 72 74, Darron Stiles 73 72 72, Alex Cejka (Ger) 73 69 75
218 Kevin Na 71 77 70, Dudley Hart 71 72 75, Colt Knost 72 73 73, Todd Hamilton 71 71 76, Tom Lehman 71 74 73, Padraig Harrington (Irl) 74 73 71, Andrew Magee 74 70 74
219 Daniel Chopra (Swe) 75 71 73, Tag Ridings 72 73 74, Tom Pernice Jnr. 72 74 73, Rob Grube 72 72 75
220 Olin Browne 72 75 73, Matt Bettencourt 68 73 79
222 Vijay Singh (Fij) 72 75 75
223 Brent Geiberger 73 75 75, Paul McGinley (Irl) 72 77 74
224 Carlos Franco (Par) 75 79 70, Jason Bohn 75 73 76
225 Brendon Todd 74 73 78
226 Robert Gamez 76 74 76
227 Robert Damron 77 69 81
230 Marc Turnesa 77 75 78
232 Troy Kelly 75 79 78
237 Jason Schmuhl 76 80 81
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