NEW ORLEANS, 26 Apr 2015 (AFP) - Rose had six birdies in his six-under 66 in the final round of the New Orleans tournament -- which was beset by weather delays -- and victory represents a satisfying follow-up to the Englishman's share of second behind Jordan Spieth at the recent Masters.
His 22-under-par total 266 gave him a seventh US tour title, by one stroke from American Cameron Tringale.
Tringale could have forced a playoff with an eagle at the final hole, but settled for a birdie that gave him a seven-under 65 and sole possession of second place on 267.
Boo Weekley also closed with a 65 on the rain-softened TPC Louisiana course to grab third place on 268. Jim Herman (65) and Australian Jason Day (69) shared fourth on 269.
Day and Rose had gone into the final round tied for the lead at 16 under after finishing their third rounds on Sunday morning.
Rain and thunderstorms had halted play every day, including a five-hour, 43-minute interruption on Saturday.
Day had five birdies and one bogey in his third-round 68, while Rose had climbed up the leaderboard with a bogey-free 65 in the third round.
Rose finished with a flourish, rolling in a 10-footer at the 71st hole and a 13-footer at the last, and has now won at least one US PGA Tour title in six straight seasons.
That streak is second only to Dustin Johnson's eight straight seasons with a title among current players.
Leading final-round scores on Sunday in the US PGA Tour's $6.9 million Zurich Classic (USA unless noted, par-72)
266 - Justin Rose (ENG) 69-66-65-66
267 - Cameron Tringale 69-65-68-65
268 - Boo Weekley 64-70-69-65
269 - Jim Herman 69-68-67-65, Jason Day (AUS) 67-65-68-69
270 - David Hearn (CAN) 65-70-67-68, Daniel Berger 66-67-68-69
271 - Blayne Barber 67-70-64-70, Chesson Hadley 67-72-66-66, Chad Campbell 67-68-68-68, Whee Kim (KOR) 68-71-68-64
272 - Steve Wheatcroft 72-66-69-65, Jason Gore 70-68-66-68, George McNeill 74-64-66-68, Sean O'Hair 65-71-68-68, Erik Compton 66-69-68-69, Steven Bowditch (AUS) 68-67-71-66, Justin Thomas 68-66-72-66, Scott Pinckney 69-70-65-68, D.A. Points 70-69-68-65, Hudson Swafford 67-66-70-69