JAKARTA, April 27, 2014 (AFP) - The 26-year-old, a three-time Asian Tour winner, sealed his victory with a four-under-par 68 at the Royale Jakarta Golf Club after breaking away from the chasing pack.
"It's really great to get my first win outside of India. I have missed out on it for a long time and I am so glad I managed to do it today," said Lahiri, who won $750,000.
"I need the world ranking points so I am really happy I can win this week."
Two big names at the tournament, rising French star Victor Dubuisson and former Major winner Louis Oosthuizen of South Africa, withdrew with shoulder and back injuries respectively.
Trailing by a single shot behind Australia's Cameron Smith, Lahiri first fired three successive birdies starting from the second hole.
He stumbled with a bogey-five on the fifth hole but recovered with another birdie on 12.
However a double-bogey six on 13 after a lengthy three-hour rain delay saw the Indian ride out a tense finish.
"I had an awkward lie on 13. During the rain delay I was just thinking that I have to get up and down there," Lahiri said, according to an Asian Tour press release.
"I got a bad break there but I know (Taiwanese) Lin Wen-tang dropped a shot as well. Unfortunately I got a double bogey there but I am glad I came back strong."
Lahiri then overtook the lead of South Korea's Baek Seuk-hyun at 16-under, screaming jubilantly as his 20-ft eagle putt sank into the hole for a winning total of 17-under-par 271.
"My mind was blank when I prepared for the last putt on 18. All I told myself was I had to get it into the hole. When I was walking up to the greens, I was actually thinking if I need to prepare for a playoff tomorrow morning," he said.
Korea's Baek finished second alongside Smith, signing off with a 65.
Leading scores after round 4 of the CIMB Niaga Indonesian Masters (par 72):
271 - Anirban Lahiri (IND) 70-69-64-68
272 - Baek Seuk-hyun (KOR) 71-68-68-65, Cameron Smith (AUS) 68-67-67-70
273 - Kiradech Aphibarnrat (THA) 71-69-65-68
274 - Thongchai Jaidee (THA) 71-72-67-64, Jazz Janewattananond (THA) 68-70-69-67, Lin Wen-tang (TPE) 70-64-72-68, S.S.P Chowrasia (IND) 71-66-69-68
275 - Rashid Khan (IND) 70-70-64-71
276 - Chapchai Nirat (THA) 68-68-72-68, Bernd Wiesberger (AUT) 68-71-69-68, Gunn Charoenkul (THA) 70-69-67-70
277 - Dimitrios Papadatos (AUS) 73-72-66-66, Chan Kim (USA) 69-69-70-69, Jyoti Randhawa (IND) 72-68-67-70
Selected scores:
280 - Danny Chia (MAS) 69-73-68-70, Lam Chih Bing (SIN) 72-68-69-71
281 - Nicholas Fung (MAS) 67-69-74-71