Curtis bogeyed his final two holes on Tuesday, but no matter. He finished with a final-round, 1-under 70 and won the Booz Allen Classic by five shots at 20-under-par 264.
Curtis' only other victory on the PGA TOUR was a memorable one. Playing in his first major championship as a tour rookie, Curtis hoisted the claret jug at the 2003 British Open.
Padraig Harrington (66), Billy Andrade (64), Nick O'Hern (67) and Steve Stricker (68) tied for second place at minus-15 at the rain-soaked TPC at Avenel.
Ben Crane (66), Jeff Gove (68) and Brett Quigley (71) shared sixth place at 14-under-par 270.
To say rain plagued this event would be an understatement.
Sunday's action was delayed several hours as storms that have hammered the mid-Atlantic portion of the United States wreaked their havoc. A Monday finish did not solve anything as heavy thunderstorms caused three delays before play was finally called at 4:45 p.m. (et).
That meant the tour faced its first Tuesday finish since the 1980 Tucson Open. More storms were forecasted for Tuesday and the start of the completion of the final round was delayed almost 45 minutes for the six players remaining.
Curtis, who pocketed $900,000 for the win, held a seven-shot lead when play was called on Monday, leaving little drama. Once play resumed on Tuesday, Curtis missed a 29-foot par putt at the 17th hole.
At the par-4 closing hole, Curtis found a fairway bunker, then landed in a greenside bunker with his second. He blasted out to 26 feet and two-putted for another bogey.
The bogey-bogey finish certainly did not threaten his chances to win the title, but did cost him the tournament record. The mark is 263 set by Andrade and Jeff Sluman in 1991 and matched by Adam Scott in 2004.
Curtis was not going to get the season's largest margin of victory either. Phil Mickelson lapped the field by 13 shots at the BellSouth Classic, the week before he won his second Masters.
Since his win at Royal St. George's three years ago, Curtis has made just 32 cuts in the 66 events on the PGA Tour calendar in which he made a start. His best finish during that period was third place at last year's Western Open.
Robert Allenby shot a 2-under 69 and tied for ninth place with Daniel Chopra, who posted a 1-under 70 in the final round. The pair finished at 13- under-par 271.