UPDATE 2-Golf-O'Hair holds off Cink to win second Tour title

(Adds O'Hair quotes, detail)

MIAMI, March 9 (Reuters) - American Sean O'Hair kept his composure to overhaul a stumbling Stewart Cink and clinch his second PGA Tour title by two shots at the Tampa Bay Championship in Palm Harbour on Sunday.

Three strokes behind the pacesetting Cink after the weather-delayed third round, O'Hair surged to victory with a two-under-par 69 in bright sunshine on the challenging Copperhead Course at Innisbrook Resort and Golf Club.

The 25-year-old Texan grabbed the outright lead for the first time by ramming in a 32-foot birdie putt at the par-three 15th and could afford the luxury of bogeying the last for a four-under total of 280.

Cink, seeking his first PGA Tour title in more than three years, squandered an early four-stroke advantage with four bogeys and a double-bogey to slide back into a six-way tie for second place with a closing 74.

Australia's John Senden eagled the par-five 14th on his way to a sparkling 67, finishing level with Cink, Japan's Ryuji Imada (68) and Americans Billy Mayfair (72), Troy Matteson (69) and George McNeill (69).

"This is just awesome," a smiling O'Hair told reporters after a confident display in breezy conditions on one of the PGA Tour's toughest layouts.

"There were a lot of demons out there, stepping up to a shot and having to back away, and just somehow I was able to pull it off."

O'Hair said he would probably enjoy his second victory more than his Tour breakthrough at the 2005 John Deere Classic in his rookie season.