Roberts' total of 265 gave him his third career win, three strokes clear of the runner-up Mark O'Meara and nine ahead of Montgomerie. Roberts' tournament record beat Hale Irwin's 18-under effort in 1994.
O'Meara finished with a 66 to compile 268 for the week, while the Masters champion, Nick Faldo, finished on a five-under-par 279, one behind Greg Norman. Faldo, who hit a final- round 70, said: "I just wasn't focused. It's tough to give it that little bit extra that you need to do well. Last week really took a lot out of me."
Citing exhaustion, Faldo pulled out of next week's tournament in Greensboro and will next play in England at the Benson and Hedges International Open and the Volvo PGA. He returns to the US Tour at the Buick Classic in June, only a week before the US Open.
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