The wind was a factor in the second round on Saturday at The Westin Savannah Harbor Resort and Spa, but Sunday brought heavier gusts and even harder conditions.
'I wouldn't play in this wind by choice, but I suppose I have some advantage,' said Smyth, a veteran of the European Tour. 'I'm used to hitting the ball low and into the wind.'
Smyth was two shots off the pace to start the day and battled to keep it together over his first nine holes. He opened with a birdie at the par-4 first, but gave that shot back with a bogey at the third. Smyth recovered with a birdie at the fourth, but suffered back-to-back bogeys starting at the par-5 sixth to fall to 6 under.
The Irishman responded again with a birdie at the par-3 eighth and was able to right the ship on the inward half. He tallied a birdie at the par-4 14th and hit his tee shot inside 4 feet for a birdie at the par-3 15th.
He parred his next two holes and walked off with his second career victory on the Champions Tour despite a bogey at the last.
'I'm excited to have won this tournament,' said Smyth, who was the only player to shoot under par on Sunday. 'This is a very fair test of golf. I still can't believe I won this tournament.'
Jenkins managed a pair of bogeys and a birdie over his first nine holes, but he picked up a birdie at the par-5 13th to reach 7 under. Jenkins then stumbled to a bogey at the par-3 15th and parred his way in to finish two shots back.
'We all knew it was going to be a tough day,' said Jenkins. 'It was a survival thing out there.'
Levi had problems early with back-to-back bogeys from the fifth, but he got a shot back with a birdie at the par-5 seventh. Levi then bogeyed the eighth to fall into a tie with Smyth atop the leaderboard and never recovered,
The 53-year-old tallied a pair of bogeys over his last four holes to join Purtzer three shots behind Smyth.
Jim Thorpe posted a 73 to take fifth place at 4-under-par 212. Mark McNulty, D.A. Weibring and Andy Bean were one shot further back at 3-under-par 213.
Craig Stadler, Jay Haas, Bob Gilder, Morris Hatalsky and David Eger tied for ninth place at 2-under-par 214.