KUALA LUMPUR, September 21, 2014 (AFP) - Chapchai played a three-under 68 for the final round, but Lascuna shot up the leaderboard to catch him at the end of regulation play thanks to a bogey-free 63.
The two were tied at a 10-under aggregate score of 274 at the Seri Selangor Golf Club outside Kuala Lumpur, forcing a playoff.
But Chapchai, whose victory Sunday is his fourth on the Asian Tour, clinched the win by rolling home a par putt on the first playoff hole after Lascuna stumbled to his first bogey of the day.
The tournament's first and second-round leader Anirban Lahiri of India finished in sole third, his final-round 68 unable to make up for a damaging five-over-par 76 he shot in the third round.
Scores in brief:
274 Chapchai Nirat (THA) 68-69-69-68 (Wins in playoff), Antonio Lascuna (PHI) 70-70-71-63
276 Anirban Lahiri (IND) 64-68-76-68
278 Scott Barr (AUS) 70-69-72-67, Paul Peterson (USA) 69-71-71-67, S.S.P. Chowrasia 66-70-73-69, David Lipsky (USA) 72-66-69-71, Cameron Smith (AUS) 68-66-71-73