South African Trevor Immelman experienced bitter disappointment on the US Tour for the second week running on Sunday.

Having lost the Wachovia Championship in a play-off to Jim Furyk after three-putting the final green, Immelman came to the last hole of the Byron Nelson Championship in Texas trailing American Brett Wetterich by one.

But hopes of victory were ended when he slightly pulled his drive and saw it bounce into the lake.

Immelman, who had bogeyed the 15th to fall behind, saved par with a brilliant 167-yard third to seven feet, but it was not enough and so he finished second again.

Wetterich, who took last place at last December's qualifying school and is ranked only 208th in the world, claimed his first title with a closing two-under-par 68 and 12-under total of 268.

Luke Donald, eighth with a round to go, lost his chance when he bogeyed the ninth and 10th, but then birdied the 13th and 14th and made an eagle putt of nearly 20 feet on the long 16th to climb into a tie for sixth spot.

Londoner Brian Davis was joint eighth a stroke further back on seven under following a 65.

Australian Adam Scott, who shared the 54-hole lead with Immelman, had a 71 and was third for the second successive Sunday.

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

(USA unless stated, par 70):

268 Brett Wetterich 66 64 70 68

269 Trevor Immelman (Rsa) 68 67 64 70

270 Adam Scott (Aus) 65 65 69 71, Omar Uresti 67 66 69 68

271 Chad Campbell 72 65 65 69

272 Luke Donald (Eng) 69 66 69 68, Shigeki Maruyama (Jpn) 71 68 67 66

273 Brian Davis (Eng) 70 68 70 65, Dudley Hart 68 68 68 69, Charley Hoffman 70 67 65 71, Rodney Pampling (Aus) 71 69 67 66, Jason Bohn 70 68 68 67

274 Arron Oberholser 74 60 72 68, J J Henry 67 70 70 67, Mathew Goggin (Aus) 68 70 69 67, Shaun Micheel 70 68 70 66, Jeff Sluman 70 70 64 70, Ernie Els (Rsa) 68 69 69 68

275 Sean O'Hair 72 66 71 66, Brian Gay 69 69 68 69

276 Duffy Waldorf 71 68 70 67, Joe Ogilvie 71 62 69 74, Wes Short jr. 68 71 66 71, Shane Bertsch 69 70 65 72, Carl Pettersson (Swe) 72 68 67 69

277 Tim Herron 67 69 70 71, Peter Lonard (Aus) 71 68 69 69, Ben Crane 71 67 69 70, Bob Estes 66 69 70 72, Justin Leonard 69 71 71 66, Brett Quigley 69 69 72 67, KJ Choi (Kor) 69 70 67 71, Bo Van Pelt 67 68 70 72

278 Scott McCarron 69 69 66 74, Phil Tataurangi (Nzl) 68 66 74 70, Billy Mayfair 71 67 69 71, Steve Lowery 65 69 71 73, Kevin Sutherland 69 68 70 71, Charles Howell III 69 69 71 69, Kenny Perry 71 69 69 69, Dean Wilson 67 70 73 68, Jay Williamson 69 72 70 67, Corey Pavin 72 66 69 71, Ryuji Imada (Jpn) 67 70 69 72

279 Matt Hansen 69 70 70 70, Eric Axley 73 67 68 71, Ted Purdy 70 69 65 75

280 Patrick Sheehan 74 65 71 70, Tom Lehman 70 69 71 70, Brent Geiberger 71 68 71 70, Ronald Whittaker 72 69 68 71, Vijay Singh (Fij) 70 67 70 73, Nathan Green (Aus) 67 72 70 71, Justin Rose (Eng) 71 67 71 71, Bubba Dickerson 67 72 68 73, Olin Browne 69 68 73 70

281 Charles Warren 70 69 69 73, Billy Andrade 73 66 68 74, Vaughn Taylor 71 70 71 69, Chris DiMarco 74 67 69 71

282 Bernhard Langer (Ger) 70 70 71 71, Nick Watney 74 64 71 73, Rory Sabbatini (Rsa) 71 68 69 74, Richard S Johnson (Swe) 71 67 68 76, B.J Staten 68 73 71 70, Tag Ridings 71 70 67 74

283 Hunter Mahan 67 74 69 73, Greg Chalmers (Aus) 73 67 69 74, Stephen Leaney (Aus) 70 70 68 75, Steve Jones 75 66 70 72

284 Robert Gamez 72 69 72 71

285 Chris Parra 73 67 74 71

286 Jeff Overton 72 68 71 75, Ryan Palmer 69 68 70 79, Jimmy Walker 71 69 75 71, Tom Pernice Jnr. 68 72 73 73

289 J.L. Lewis 71 70 74 74

291 Brian Bateman 72 69 74 76

292 David McKenzie (Aus) 71 70 70 81, James Driscoll 67 70 81 74