Nick O&aposHern finished in a tie for third as Geoff Ogilvy faltered in the final round to hand Englishman Paul Casey his maiden US PGA Tour victory at the Shell Houston Open. Casey, a nine-time winner on the European Tour, held off American JB Holmes in a playoff at Redstone Golf Club to reach the winner&aposs circle in the United States for the first time in 77 starts at the age of 31. The Englishman had led by a stroke going to the 18th hole with Holmes having finished some two hours and 40 minutes earlier with a 69 to get to 11-under. The 488-yard, par-four 18th, with water all the way down the left side, was playing the most difficult hole on the course, however, and Casey approached it needing a rare level score to win. Taking a three wood off the tee, the Englishman found the right fairway but with his approach shot to the green landed in sand in a right greenside bunker and from an awkward stance could only get his sand wedge to 35 feet from the hole. Casey two-putted from there for bogey and a final-round, level-par 72 to finish on 11-under and went back to the 18th tee for sudden death with Holmes. The lengthy wait did not help for the big-hitting Holmes who sent his tee shot at the extra hole into the water while Casey again took three wood and found a right fairway bunker Holmes got onto the green in four and came up short with his 45-foot bogey putt, leaving Casey with two putts for victory from 28 feet. His first putt rolled up to within two feet and Casey holed out for victory. O&aposHern compiled a two-under 70 to finish the tournament at nine-under alongside Swede Henrik Stenson and US veteran and former Masters champion Fred Couples, who had led at 12-under for much of the final round before bogeying the final three holes to finish with a 74. Casey had been one of six co-leaders at 11-under when the third round was completed early on Sunday, with 19 players within three shots of the lead. Casey, Ogilvy and American Colt Knost maintained the lead they had shared with Tommy Armour III and John Senden at the halfway mark, each firing third-round, three-under-par 69s. They were joined by Americans Bo Van Pelt and the 49-year-old Couples, who shot 68s and their compatriot Ryan Moore, who posted a 67. Casey, a winner in Au Dhabi in January and losing finalist at the WGC-Accenture Match Play final on March 1, ran into trouble with a bogey at the par-four second but responded with a birdie three at the third while Couples and Knost had moved into the lead at 12-under. Couples found water at the eighth on the way to a bogey six to share the lead with Casey at 11-under with Casey, who had played five, while Knost double bogeyed the fifth to fall to 10-under. Holmes took the clubhouse lead at 11-under while Casey pulled level with Couples at 12-under when he birdied the par-five 13th and then found himself in the outright lead when the American bogeyed the 16th as Holmes returned to the driving range in anticipation of a playoff. Ogilvy finished in a five-way tie for sixth place at eight-under following a final-round three-over 75 alongside Americans Tommy Armour III, Jason Bohn, Mahan and John Mallinger. Jarrod Lyle, Stuart Appleby and John Senden were tied for 31st at three-under. Greg Norman&aposs tournament unravelled in the final round as the 54-year-old shot an 81 to finish at three-over while Sergio Garcia&aposs torrid afternoon also ended with an 81 to leave him at seven-over. Meanwhile, New Zealand&aposs Mark Brown was the leading Australasian in a tie for 28th place as Northern Ireland&aposs Michael Hoey came from five shots back and then won a three-hole playoff to capture his first European Tour title. Thirty-year-old Hoey, at long last joining former Walker Cup team-mates Luke Donald, Graeme McDowell and Nick Dougherty as a winner on the circuit, beat Spain&aposs Gonzalo Fernandez-Castano in the Estoril Portuguese Open at Oitavos Dunes. Brown started the day in a share of 11th but could only manage a 73 on the final day to finish at one-under. Aussie Wade Ormsby tied for 43rd at two-over, while compatriot Michael Curtain took a share of 63rd place at four-over-par. Final Round of the Houston Open, Redstone Golf Club, Texas -11: Paul Casey 66 70 69 72 (won playoff), J.B Holmes 71 69 68 69 -9: Fred Couples 68 69 68 74, Nick O&aposHern (Australia) 72 71 66 70, Henrik Stenson 70 67 72 70 -8: Tommy Armour 66 70 72 72, Jason Bohn 69 71 66 74, Geoff Ogilvy (Australia) 67 69 69 75, Hunter Mahan 71 69 72 68, John Mallinger 75 65 70 70 -7: Ryan Moore 70 68 67 76, Nicholas Thompson 65 75 71 70, Lee Westwood 69 70 68 74 -6: Jonathan Byrd 67 70 70 75, Brian Davis 71 69 68 74, Ernie Els 75 66 71 70, Robert Karlsson 70 71 66 75, D.A. Points 66 72 72 72 Also: -3: Stuart Appleby (Australia) 70 68 71 76, Jarrod Lyle (Australia) 71 68 71 75, John Senden (Australia) 65 71 71 78 -2: Marc Leishman (Australia) 68 73 71 74 E: Peter Lonard (Australia) 73 69 68 78 +1: Steve Elkington (Australia) 71 71 69 78 +3: Greg Norman (Australia) 71 69 70 81, James Nitties (Australia) 66 72 75 78 Final Round of the Estoril Open, Oitavas Dunes, Cascais, Portugal -7: Michael Hoey 66 76 69 66 (won playoff), Gonzalo Fdez-Castano 70 72 68 67 -6: Francesco Molinari 71 71 68 68 -5: Paul Broadhurst 71 68 67 73, Jamie Donaldson 71 69 67 72, Mikael Lundberg 70 72 67 70 -4: Gregory Bourdy 69 73 69 69, Alastair Forsyth 67 73 69 71, Paul Lawrie 71 69 68 72, David Lynn 69 73 65 73, Steve Webster 68 72 71 69 -3: Carlos Del Moral 67 71 71 72, Francois Delamontagne 71 73 66 71, David Dixon 69 73 68 71, Rafa Enchenique 74 70 71 66, David Horsey 68 74 71 68, Michael Jonzon 72 71 70 68, Maarten Lafeber 72 71 64 74, Callum Macaulay 70 70 72 69, Ross McGowan 64 73 71 73 Also: +2: Wade Ormsby (Australia) 69 74 72 71 +4: Michael Curtain (Australia) 70 74 71 73