(CNN) -- Brian Gay re-wrote the record books on Sunday when he cruised to his second US PGA Tour career victory, at Harbour Town Golf Links on Hilton Head Island, South Carolina.
American Brian Gay earned a slot at the 2010 Masters following his record victory at the Heritage.
American Gay's final round of 64 in the Heritage gave him a tournament record low of 20 under par, one better than Loren Roberts in 1996, to win by 10 strokes.
It was the the largest win margin at the venue, eclipsing Davis Love III's seven-shot win in 1998, and earned him a slot at next year's Masters.
Luke Donald finished in a tie for second with Briny Baird having started the day in a tie for 10th. Baird shot a closing 68 but even Donald's eight-birdie, three-bogey 66 could not stop Gay increasing his advantage.
"Just another unbelievable day," said Gay, who won his maiden title at the Mayakoba Golf Classic in Mexico last year.
Gay began his round at 13 under, three shots clear of New Zealander Tim Wilkinson, and quickly doubled his advantage when he birdied the par-four first and then eagled the par-five second.
Five more birdies followed, his only bogey -- and second of the week -- coming at the 12th and failing to halt the victory procession.
Donald and Baird ended at 10 under while two-time US Open champion Lee Janzen carded a level-par 71, missing out on a share of second when he bogeyed the last.
That put him into a tie for fourth with former Open winner Todd Hamilton, who closed with a 70.
Spain's Jose Maria Olazabal finished in a tie for sixth at eight under with the fading Wilkinson following a final-round 67.
Houston Open winner Paul Casey's 66 pushed him into a tie for 11th with Woody Austin at six under while Germany's Alex Cejka was in an eight-man group at five under.