Adam Scott captured his second PGA Tour win of the season after equalling the tournament scoring record in a four-shot victory at the Booz Allen Classic in Potomac, Maryland.

The 23-year-old Australian closed with a three-under-par 68 to finish with a 72-hole total of 21-under-par 263.

He matched the tournament record set by Billy Andrade and Jeff Sluman at the 1991 Kemper Open.

Charles Howell III made a late charge but settled for second place at 17 under on 267 after a closing round of 65.

Defending champion Rory Sabbatini, of South Africa, finished with a 66 to claim third at 15 under on 269.

No one else was within eight strokes of Scott as Arron Oberholser (70), Tim Herron (67) and Bo Van Pelt (67) shared fourth place at 12 under on 272.

Alex Cejka (69) of Germany and Olin Browne (69) were another shot back.

Collated final round scores (USA unless stated, par 71):

263 Adam Scott (Aus) 66 62 67 68

267 Charles Howell III 61 69 72 65

269 Rory Sabbatini (Rsa) 67 67 69 66

272 Tim Herron 69 68 68 67, Bo Van Pelt 69 68 68 67, Arron Oberholser 69 65 68 70

273 Olin Browne 64 66 71 72, Alex Cejka (Ger) 74 63 67 69

274 Frank Lickliter II 67 69 72 66, Aaron Barber 70 68 68 68

275 Tom Lehman 66 67 71 71, Ryan Palmer 70 69 68 68, Duffy Waldorf 67 71 66 71, Jeff Sluman 65 71 69 70, Harrison Frazar 67 69 70 69

276 Rich Barcelo 71 69 69 67, Tom Pernice Jnr. 68 71 69 68

277 Guy Boros 68 69 71 69, Kevin Na (Kor) 68 71 64 74, J J Henry 68 69 70 70

278 Vaughn Taylor 68 71 68 71, Billy Andrade 68 71 72 67, Ben Crane 70 70 66 72, Scott Hend (Eng) 66 72 69 71, Joe Durant 69 71 68 70, David Morland IV (Can) 69 71 72 66, Bart Bryant 71 67 67 73, Danny Ellis 67 69 71 71

279 Matt Gogel 69 70 71 69, Hidemichi Tanaka (Jpn) 70 65 73 71, Craig Barlow 69 68 69 73, Michael Allen (Irl) 70 71 69 69

280 Brent Geiberger 71 68 72 69, Esteban Toledo (Mex) 69 71 68 72, Steve Stricker 67 68 71 74, Mark Wilson 69 72 69 70, Shaun Micheel 67 72 66 75, Pete Jordan 72 67 72 69, Notah Begay III 72 65 71 72, Chris Riley 72 66 69 73, Bill Glasson 72 69 67 72, Bill Haas 69 65 73 73

281 Dan Briggs 70 69 69 73, Corey Pavin 70 68 70 73, David Branshaw 69 70 71 71, Glen Day 69 62 79 71, Mark Hensby (Aus) 68 72 70 71, Luke Donald (Eng) 72 68 70 71, John Cook 71 69 69 72, Michael Bradley 70 65 70 76

282 Rich Beem 64 67 72 79, Charlie Hoffman 69 70 71 72, Richard S Johnson (Swe) 72 67 72 71, Brad Faxon 74 66 71 71, Jeff Brehaut 70 69 71 72, Carl Pettersson (Swe) 67 71 70 74

283 David Edwards 68 73 71 71, Pat Bates 70 71 72 70, Garrett Willis 71 68 70 74, Len Mattiace 71 69 71 72, Daniel Chopra (Swe) 72 69 70 72, Steve Allan (Aus) 69 67 75 72, Tommy Tolles 69 72 71 71, Cameron Beckman 70 68 79 66

284 Billy Mayfair 66 70 75 73

285 Heath Slocum 70 69 74 72, Kelly Mitchum 72 69 76 68, Cliff Kresge 71 68 74 72

286 Jonathan Kaye 70 70 71 75, Tom Byrum 72 69 76 69

287 Patrick Sheehan 68 71 77 71, Hunter Mahan 69 70 73 75, Geoff Ogilvy (Aus) 70 68 74 75, Kelly Gibson 71 70 72 74, Aaron Baddeley (Aus) 67 74 74 72

289 Mike Grob 72 68 72 77

290 Steve Pate 68 73 76 73, Dicky Pride 68 71 76 75

293 John Daly 70 70 76 77

301 Jay Don Blake 69 70 77 85