American Kevin Kisner secured his first PGA Tour title with a six-stroke victory in the RSM Classic at Georgia's Sea Island.

The 31-year-old from South Carolina never looked in danger of relinquishing his overnight three-shot advantage over fellow American Kevin Chappell and a second successive round of 64 saw him finish on 22 under par.

Kisner set a new tournament record score of 260, with Northern Ireland's Graeme McDowell finishing in third place on 15 under.

McDowell, who won the OHL Classic last week, started Sunday's final round four strokes adrift, but could not reel in Kisner.

The American hit five birdies on the opening nine holes - including one from more than 30 feet - to strengthen his position at the top of the leader board as he went on to finish well clear of the field.

Chappell had picked up two shots before a bogey on the seventh and, although he rolled in successive birdies from the 16th, his challenge had already faded and ended with a another bogey on the 18th. He had to settle, like McDowell, for a 67.

Kisner had lost play-offs at the RBC Heritage, the Players Championship and the Greenbrier before finishing second at the WGC-HSBC Champions tournament in Shanghai a fortnight ago.