However, Britain's Nick Faldo completed a miserable tournament with a 67 to finish on a one-under-par aggregate of 283, while David Feherty was four shots better off after a final round of 71.
Singh, who has been involved in four play-offs during his career and won them all, was forced into the sudden-death climax by tying with Mayfair after the pair shot five under par rounds of 66 to finish on 15 under - two shots clear of the overnight leader, Ben Crenshaw.
However, Singh cut the play-off short by sinking a two-foot par putt on the first hole, after Mayfair missed his putt, to seal victory.
"In a play-off you can play more aggressively than normal because you know you've secured second place and no one can take that from you," Singh said. "You're just playing for first."Reuse content