Phil Mickelson landed his second title of the year when he held off the challenge of Nick Watney at the WGC-CA Championship.
Mickelson, who had been treated overnight for heat exhaustion and dehydration, showed no ill effects from his visit to a hospital emergency room as he outfought fellow American Watney over the back nine at Doral having emerged from a see-saw battle with the world number 78 in the first half of the final round.
World number three Mickelson parred the final seven holes to collect the $1.4 million (Ј978,747) winner's cheque with a last-day 69 to finish at 19 under par, one shot better than his overnight co-leader Watney.
It was his first World Golf Championships victory and his 36th on the PGA Tour, adding to his Northern Trust Open win at Riviera Country Club last month.
Mickelson revealed he had been suffering from a virus for the past three days and was concerned about his health throughout his final round as he tried to stay hydrated by sipping frequently from bottles of Gatorade.
"I fought hard all day and wasn't really able to pay attention to some of the great shots that Nick hit because I was so worried about keeping my energy level high and steady throughout the round," Mickelson said.
"I haven't eaten much in three days and I fought hard. I knew I was playing some of my best golf coming in here and I was playing well so I'm very excited to have finished it off."
Jim Furyk was a strong-finishing third at 16 under par following a closing 67, with India's Jeev Milkha Singh fourth on 14 under.
England's Oliver Wilson scored his best finish on the US PGA Tour when he shot a 66 to finish in a tie for fifth place alongside Colombia's Camilo Villegas, with Denmark's Soren Kjeldsen and Thomas Aiken of South Africa tied for seventh on 12th under.
World number one Tiger Woods produced his second 68 of the weekend to finish tied for ninth with Rod Pampling of Australia and fellow American Kenny Perry at 11 under, to maintain his record of always finishing in the top 10, both in WGC stroke play events and at Doral.
The lead had changed hands three times between Mickelson and Watney over the front nine with Watney holing in a chip at the ninth from 80 feet and from beneath the hole at the back of the green, and between a spectator stand and a television tower.
Both men birdied the 10th to go to 20 under but Watney dropped a shot at the 11th and they both bogeyed the 12th.
Furyk moved to 16 under with birdies at the 15th and 16th holes but Mickelson kept his nerve to par all his remaining holes and stay one shot ahead of his rival.
Watney had one final chance to put pressure on Mickelson on the last green with a birdie putt from 29 feet on the fringe but his ball stopped just a couple of feet short, and Mickelson putted from inside three feet for victory.
"I thought it was on a really good line," Watney said of his putt on 18. "I can't believe I left it short.
"Unfortunately I just didn't hit it hard enough.
"I'm pleased with the way I played. Right now it still hurts to finish second - disappointing to come up one shot short. But overall it was a positive week, and I've just got to keep working hard."
Wilson was delighted with his week and a final-round, six-birdie, no-bogey 66 on the par-72 Blue Monster course.
"It feels pretty good to be honest," Wilson said afterwards.
"Yesterday was probably one of the best rounds I've played for a while, shooting level, I really hung in and ground it out and it gave me a chance to do what I did today so it worked out pretty good."
Ian Poulter wrapped things up for a final-round 69 to finish on 10 under in a seven-way tie for 13th that included Soren Hansen of Denmark and Spain's Alvaro Quiros
Rory McIlroy's tournament ended in disappointing fashion with a bogey at the last for a final-round 73 but the 19-year-old from Northern Ireland still managed a second consecutive top-20 finish in the US having finished tied for 13th at the Honda Classic.
McIlroy finished in a tie for 20th at nine under par, the same mark achieved by, among others, Luke Donald (72), Ernie Els (70), Padraig Harrington (71) and Justin Rose (68).
Richard Finch had started his round with a four birdies in a row but ended his week with a double-bogey six at the last to card a 71 and finish at four under, one better than fellow Englishman Ross Fisher.
Collated final round scores & totals in the WGC-CA Championship, Doral Resort & CC, Miami, Florida, United States of America
(USA unless stated, par 72):
269 Phil Mickelson 65 66 69 69
270 Nick Watney 66 67 67 70
272 Jim Furyk 68 68 69 67
274 Jeev Milkha Singh (Ind) 65 71 68 70
275 Oliver Wilson (Eng) 67 70 72 66, Camilo Villegas (Col) 67 68 69 71
276 Thomas Aiken (Rsa) 74 66 71 65, Soren Kjeldsen (Swe) 70 66 69 71
277 Kenny Perry 70 64 71 72, Justin Leonard 69 69 68 71, Rodney Pampling (Aus) 66 69 71 71, Tiger Woods 71 70 68 68
278 Steve Stricker 69 70 70 69, Charley Hoffman 68 70 67 73, Sean O'Hair 67 70 74 67, Soren Hansen (Den) 74 69 64 71, Prayad Marksaeng (Tha) 65 70 72 71, Ian Poulter (Eng) 69 67 73 69, Alvaro Quiros (Spa) 72 64 69 73
279 Rory McIlroy (NIrl) 68 66 72 73, James Kingston (Rsa) 66 74 67 72, Justin Rose (Eng) 73 70 68 68, Ernie Els (Rsa) 70 71 68 70, Luke Donald (Eng) 69 70 68 72, Louis Oosthuizen (Rsa) 67 69 73 70, Padraig Harrington (Irl) 66 71 71 71
280 Tim Clark (Rsa) 71 71 69 69
281 Robert Allenby (Aus) 69 71 72 69, Davis Love III 70 71 70 70, Ben Curtis 71 69 71 70
282 Paul Casey (Eng) 71 66 72 73, Robert Karlsson (Swe) 71 70 72 69, Sergio Garcia (Spa) 72 72 68 70, Briny Baird 70 68 71 73
283 Dustin Johnson 70 66 71 76, Pat Perez 70 68 72 73, Mike Weir (Can) 71 69 70 73, Martin Kaymer (Ger) 73 68 70 72, Carl Pettersson (Swe) 74 69 69 71
284 Peter Hanson (Swe) 70 74 72 68, Richard Finch (Eng) 72 72 69 71, Ryuji Imada (Jpn) 70 71 69 74, Ken Duke 71 75 67 71, Geoff Ogilvy (Aus) 73 69 70 72, Stephen Ames (Can) 72 70 71 71
285 Ross Fisher (Eng) 71 69 72 73, Garth Mulroy (Rsa) 70 70 72 73, Andres Romero (Arg) 67 71 77 70, Mark Brown 73 71 68 73, Darren Clarke (NIrl) 74 71 71 69, Shingo Katayama (Jpn) 70 70 72 73, D.J. Trahan 77 71 66 71
286 Hunter Mahan 71 74 68 73, Chad Campbell 72 70 70 74, Vijay Singh (Fij) 69 72 71 74, Rory Sabbatini (Rsa) 69 74 74 69, Zach Johnson 70 72 72 72
287 Anthony Kim 71 69 72 75
288 K J Choi (Kor) 73 73 72 70, Stewart Cink 73 73 69 73
289 Dudley Hart 71 75 73 70, Boo Weekley 69 75 75 70, Kevin Sutherland 74 76 68 71, Stuart Appleby (Aus) 71 71 69 78, Lee Westwood (Eng) 71 71 78 69
290 Retief Goosen (Rsa) 65 76 73 76, Graeme McDowell (NIrl) 73 74 70 73, Adam Scott (Aus) 71 76 72 71, Wen-Tang Lin (Tai) 75 70 70 75
291 John Rollins 76 71 71 73, Trevor Immelman (Rsa) 74 76 72 69
292 Bubba Watson 72 71 74 75
293 Richard Sterne (Rsa) 70 76 72 75
294 Yong-eun Yang (Kor) 73 70 73 78
295 Miguel Angel Jimenez (Spa) 69 72 76 78
297 Azuma Yano (Jpn) 77 71 76 73
298 Billy Mayfair 75 72 75 76, Henrik Stenson (Swe) 69 73 73 83
299 Pablo Larrazabal (Spa) 76 71 75 77
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