Nick Watney produced a stunning eight-under-par 64 to snatch a one-stroke lead at the halfway stage of the Wells Fargo Championship at Quail Hollow.
The world No.25, without a top-10 finish in a PGA Tour stroke play event for over seven months, carded seven birdies and an eagle to edge ahead of fellow American Webb Simpson after 36 holes in South Carolina.
Watney found 17 greens in regulation en route to posting his lowest round of the season so far.
The resident of Las Vegas, who arrived at Charlotte in mediocre form, admitted after Friday's excellent round: "I think last week missing the cut was a wake-up call for me.
"I've worked really hard these five days leading into this event. I think it just shows I'm making progress.
"Who knows what's going to happen this weekend but I'm really excited for it. More hard work and hopefully I'll be in this position a lot more."
Simpson had started the day in a three-way share of the lead with Stewart Cink and Ryan Moore.
However Cink dropped to a share of third with Moore down in seventh.
Americans dominate the leaderboard, though, and hold eight of the top nine spots while the leading Europeans are Rory McIlroy and Robert Karlsson who are six strokes of the pace.
McIlroy, winner of this event two years ago, carded a second round 68 that yielded five birdies and a single bogey.
Lee Westwood and Phil Mickelson both recorded 72s to edge their way into the weekend on one under, however Tiger Woods failed to make the cut by one shot.
Defending champion Lucas Glover also bowed out with a round of 76 ending his challenge.
Collated second round scores & totals
(USA unless stated, par 72):
132 Nick Watney 68 64
133 Webb Simpson 65 68
134 D.A. Points 66 68, Ben Crane 70 64, John Senden (Aus) 66 68, Stewart Cink 65 69
135 Ryan Moore 65 70
136 Hunter Haas 68 68, Heath Slocum 69 67
137 Arjun Atwal (Ind) 68 69, Johnson Wagner 71 66, Rocco Mediate 68 69
138 Seung-yul Noh (Kor) 68 70, Martin Flores 68 70, John Merrick 70 68, Billy Mayfair 67 71, Robert Karlsson (Swe) 71 67, George McNeill 70 68, Rory McIlroy (NIrl) 70 68, Sang-moon Bae (Kor) 69 69, Rickie Fowler 66 72, Jonathan Byrd 69 69
139 Jeff Overton 68 71, Richard H. Lee 70 69, David Toms 74 65, Ben Curtis 69 70
140 Brendon De Jonge 67 73, Brian Davis (Eng) 66 74, Spencer Levin 72 68, Roberto Castro 68 72, Patrick Reed 66 74, Tommy Gainey 68 72, Jason Day (Aus) 70 70
141 Robert Garrigus 69 72, Zach Johnson 70 71, Brian Harman 67 74, Geoff Ogilvy (Aus) 71 70, James Driscoll 71 70, Jonas Blixt (Swe) 68 73, Hunter Mahan 73 68, Sung-hoon Kang (Kor) 71 70, Sean O'Hair 72 69, Andres Romero (Arg) 70 71, Ryuji Imada (Jpn) 69 72, Dicky Pride 69 72, Tom Gillis 73 68, Camilo Villegas (Col) 71 70, Carl Pettersson (Swe) 69 72
142 Chris Kirk 75 67, David Hearn (Can) 70 72, Harris English 70 72, Aaron Baddeley (Aus) 69 73, Kevin Stadler 68 74, J.B. Holmes 71 71, J J Henry 73 69, Jim Furyk 71 71, Marc Leishman (Aus) 75 67, Kyle Reifers 70 72, Jimmy Walker 69 73, Brandt Jobe 72 70, Martin Laird (Sco) 72 70, Josh Teater 69 73
143 Gary Christian (Eng) 73 70, Will Claxton 71 72, Gavin Coles (Aus) 72 71, Kevin Chappell 72 71, Alexandre Rocha (Bra) 68 75, Brendan Steele 71 72, Phil Mickelson 71 72, Chad Campbell 72 71, Ken Duke 72 71, Troy Matteson 74 69, Cameron Tringale 69 74, Lee Westwood (Eng) 71 72
The following players failed to make the cut
144 Patrick Sheehan 72 72, Tiger Woods 71 73, Garth Mulroy (Rsa) 70 74, Greg Owen (Eng) 71 73, Chris Couch 73 71, Matt Bettencourt 77 67, Nathan Green (Aus) 73 71, Mike Weir (Can) 71 73, Kevin Kisner 72 72, Henrik Stenson (Swe) 74 70, Chris Stroud 73 71, Pat Perez 73 71, Chris Di Marco 69 75, Angel Cabrera (Arg) 71 73, Charlie Wi (Kor) 74 70, Trevor Immelman (Rsa) 74 70, Mathew Goggin (Aus) 75 69, Jhonattan Vegas (Ven) 72 72
145 Scott Brown 75 70, Kyle Stanley 70 75, Steve Flesch 75 70, Colt Knost 73 72, Kyle Thompson 71 74, Steve Wheatcroft 71 74, J.J Killeen 73 72, Vijay Singh (Fij) 68 77, Michael Thompson 71 74, Ted Potter, Jr. 74 71, Bill Haas 73 72, David Mathis 75 70, Stuart Appleby (Aus) 72 73
146 Keegan Bradley 70 76, Joe Ogilvie 71 75, Stephen Gangluff 74 72, Chez Reavie 71 75
147 Robert Allenby (Aus) 70 77, Retief Goosen (Rsa) 72 75, John Huh (Kor) 76 71, William McGirt 74 73, Jamie Lovemark 75 72, Stephen Ames (Can) 74 73, Blake Adams 74 73
148 Kris Blanks 75 73, Rory Sabbatini (Rsa) 70 78, Vaughn Taylor 75 73, Lucas Glover 72 76, Edward Loar 78 70, Hank Kuehne 73 75, Troy Kelly 74 74, Daniel Summerhays 71 77, Tim Clark (Rsa) 73 75
149 Kevin Na 73 76, Jeff Maggert 70 79, Bill Lunde 71 78, Marco Dawson 77 72, Brendon Todd 79 70, Derek Lamely 76 73, Tommy Biershenk 76 73, Jason Bohn 76 73
150 Jason Kokrak 74 76, Erik Compton 75 75, David Duval 76 74, Charles Howell III 71 79, Mark Anderson 73 77, Mark Wilson 77 73, Cameron Beckman 72 78, Miguel Angel Carballo (Arg) 74 76, Russell Knox (Sco) 77 73
151 Scott Stallings 77 74, Bobby Gates 73 78, Tom Pernice Jnr. 76 75
152 Billy Hurley III 77 75, Frank Adams 76 76
153 Rick Lewallen 76 77, Nick Flanagan (Aus) 73 80
154 Nick O'Hern (Aus) 77 77
155 Bryan Bigley 80 75
DQ: Danny Lee (Nzl) 69 79
WD: Anthony Kim 74, Bo Van Pelt 78, Charlie Beljan 78nd
