Chad Campbell carded a six-under-par 66 to overcome a four-shot deficit and win by six strokes at the Bay Hill Invitational in Florida.

Campbell finished on 18 under at 270 - well clear of third-round leader Stuart Appleby who carded a disastrous 76.

The 29-year-old was still four strokes behind Appleby with 12 holes to play but staged a stunning fightback to win as the Australian collapsed.

Tiger Woods, who was looking for a record fifth straight victory in this tournament, shot a 73 and finished in a tie for 46th - his worst finish in five years on the Tour.

John Daly looked set to finish third but fell away spectacularly on the final four holes with a double-bogey, eagle, bogey, triple-bogey finish and ended up in a tie for 10th.

Scott Verplank and Australian Adam Scott eventually tied for third, one shot ahead Jerry Kelly.

Northern Ireland's Darren Clarke shot a final round of 72 to finish in a tie for sixth alongside Zach Johnson, Stephen Ames and halfway leader Shigeki Maruyama.

Collated final-round scores (USA unless stated, par 72):

270 Chad Campbell 66 68 70 66

276 Stuart Appleby (Aus) 67 67 66 76

277 Scott Verplank 68 68 73 68, Adam Scott (Aus) 68 70 68 71

278 Jerry Kelly 67 69 73 69

280 Zach Johnson 67 68 75 70, Darren Clarke (NIrl) 66 68 74 72, Stephen Ames (Tri) 72 65 73 70, Shigeki Maruyama (Jpn) 66 66 75 73

281 John Daly 68 70 70 73, Dennis Paulson 72 67 72 70

282 Tom Lehman 70 74 70 68

283 Bo Van Pelt 72 72 70 69, Mathias Gronberg (Swe) 69 72 72 70

284 Kenny Perry 69 72 72 71, Fredrik Jacobson (Swe) 70 69 70 75, J.L. Lewis 71 70 71 72, Fred Couples 76 67 68 73, Lee Westwood (Eng) 73 69 74 68, John Riegger 72 67 72 73, Mark Hensby (Aus) 72 70 70 72, Steve Lowery 70 67 71 76, Charles Howell III 71 71 71 71

285 Rodney Pampling (Aus) 69 70 69 77, Tim Herron 70 73 71 71, Justin Rose (Eng) 71 70 69 75, Brad Faxon 68 73 77 67, Craig Barlow 72 68 72 73, Ryan Palmer 71 72 72 70, Jeff Sluman 72 68 73 72

286 Davis Love III 69 74 71 72, Kirk Triplett 72 68 73 73, Frank Lickliter II 74 67 73 72, Sergio Garcia (Spa) 73 66 70 77, Niclas Fasth (Swe) 71 71 70 74, Vijay Singh (Fij) 68 72 70 76, Lee Janzen 70 66 78 72, Thomas Bjorn (Den) 71 70 73 72, Brett Quigley 71 70 72 73

287 Patrick Sheehan 70 71 74 72, Jose-Maria Olazabal (Spa) 73 71 71 72, Bernhard Langer (Ger) 72 70 71 74, Joe Durant 72 70 73 72, Steve Flesch 73 68 72 74, Ben Curtis 69 69 77 72

288 Brian Gay 68 71 71 78, Neal Lancaster 76 67 75 70, Arron Oberholser 71 73 70 74, Stewart Cink 73 71 74 70, Kent Jones 72 70 75 71, Alex Cejka (Ger) 72 70 71 75, Loren Roberts 70 71 72 75, Trevor Immelman (Rsa) 73 69 76 70, Gene Sauers 75 69 72 72, Tiger Woods 67 74 74 73

289 Omar Uresti 71 71 73 74, Aaron Baddeley (Aus) 68 74 71 76, Danny Ellis 70 67 77 75, Mark O'Meara 69 73 73 74

290 Ben Crane 72 71 73 74, Harrison Frazar 76 68 71 75

291 Tim Petrovic 72 72 69 78, Hunter Mahan 69 69 79 74, Woody Austin 73 70 77 71, Phillip Price (Wal) 73 71 72 75

292 Billy Andrade 72 72 73 75, Tom Watson 70 74 75 73

293 Nick Faldo (Eng) 70 72 77 74

294 Mike Heinen 71 71 75 77, Todd Hamilton 71 70 77 76

296 Scott McCarron 69 71 82 74

297 Stephen Leaney (Aus) 72 71 78 76

298 Dicky Pride 72 71 80 75