Ted Purdy compiled a flawless final round to charge to a one-stroke victory at the Byron Nelson Championship in Texas.

Purdy, who teed off two strokes behind overnight leader Sean O'Hair, missed only one green in regulation on his way to a five-under-par 65 at the Las Colinas TPC at the Four Seasons Resort.

He never surrendered the lead on the back nine, completing the final 27 holes without dropping a shot to finish on 15 under at 265 and earn his first PGA Tour victory.

O'Hair shot a 68 that included a birdie at the last to finish second at 266.

Vijay Singh finished tied for third alongside Bob Tway and Doug Barron, four shots behind.

Singh, who had a hole-in-one at the 17th, narrowly failed to regain the world number one ranking from Tiger Woods, who missed the cut on Friday.

Collated fourth round scores and totals in the USPGA Tour EDS Byron Nelson Classic, The TPC at Four Seasons & Cottonwood Valley GC, Irving, Texas, United States of America

(USA unless stated, par 70):

265 Ted Purdy 65 67 68 65

266 Sean O'Hair 66 65 67 68

269 Doug Barron 69 66 65 69, Bob Tway 68 68 66 67, Vijay Singh (Fij) 68 67 69 65

270 Scott Verplank 68 67 65 70, Omar Uresti 65 70 69 66, Shigeki Maruyama (Jpn) 67 67 68 68, Nick Price (Zim) 66 69 68 67

271 Jaxon Brigman 72 66 64 69, Ernie Els (Rsa) 64 72 69 66, Mark Brooks 71 69 65 66, J J Henry 67 69 67 68

272 John Rollins 67 68 68 69, Phil Mickelson 69 66 70 67, Rory Sabbatini (Rsa) 70 69 69 64, Skip Kendall 70 68 68 66

273 Vaughn Taylor 67 71 69 66, Corey Pavin 69 68 68 68, Jim Furyk 68 69 69 67, Jesper Parnevik (Swe) 69 67 68 69, Luke Donald (Eng) 68 69 67 69, Brett Wetterich 64 67 73 69, Heath Slocum 69 66 69 69, Todd Hamilton 67 67 65 74, J.P. Hayes 69 65 72 67

274 Jay Williamson 67 70 66 71, Rodney Pampling (Aus) 72 68 67 67, Kevin Sutherland 69 70 69 66, Billy Mayfair 70 63 72 69, Stephen Leaney (Aus) 69 68 68 69, Stuart Appleby (Aus) 63 73 68 70, John Senden (Aus) 70 68 70 66, Mark O'Meara 69 69 67 69

275 James Driscoll 73 67 68 67, Ryuji Imada (Jpn) 68 70 68 69, Sergio Garcia (Spa) 71 68 66 70, Craig Perks (Nzl) 71 68 66 70, Scott McCarron 68 70 69 68

276 Jerry Kelly 73 66 66 71, Bernhard Langer (Ger) 73 67 69 67, Bo Van Pelt 67 69 68 72, Mark Wilson 68 70 69 69, Ian Leggatt (Can) 66 73 68 69, John Cook 69 69 69 69, Stewart Cink 71 67 67 71, Trevor Immelman (Rsa) 67 72 70 67

277 John Daly 64 73 71 69, Kenny Perry 67 70 74 66, Justin Rose (Eng) 69 71 68 69, Ben Crane 70 66 68 73, Briny Baird 68 72 68 69, Cameron Beckman 66 70 71 70

278 Jonathan Byrd 71 68 69 70, Geoff Ogilvy (Aus) 69 71 65 73

279 Chad Campbell 70 70 72 67, Steve Elkington (Aus) 72 67 71 69

280 Brandt Jobe 69 69 68 74, Justin Leonard 72 68 72 68, Robert Allenby (Aus) 68 70 68 74, Paul Gow (Aus) 66 72 71 71, Jim Carter 72 68 71 69, Tom Gillis 69 70 68 73

281 Steve Stricker 69 68 71 73, Steve Lowery 65 69 72 75, Todd Fischer 66 69 71 75, Harrison Frazar 66 70 75 70

282 Daniel Chopra (Swe) 70 66 75 71

283 Gavin Coles (Aus) 66 71 69 77

284 Hunter Mahan 72 68 74 70

285 Pat Perez 68 71 74 72

286 Jason Hartwick 66 72 78 70, Brendan Jones (Aus) 69 71 74 72

288 Glen Day 66 73 71 78

289 Tim Petrovic 69 71 74 75, Mark Hensby (Aus) 67 72 79 71