Anirban produced a stunning run of seven consecutive birdies to take the Venetian Macao Open to a play-off eventually finishing in second place.
The 2014 champion opened the week with a round of 66 and followed that up with scores of 68 and 69 and shared the lead heading into the final day.
Thai player Pavit Tangkamolprasert set the pace with a round of 64 to get to -16 and that mark looked some way off for Anirban as he bogeyed the 11th at Macau Country Club to slip back to nine under.
But he produced an incredible burst of scoring to pick up shots at each of the remaining holes to extend the tournament.
Tangkamolprasert birdied the 18th on the first extra hole to take the title. Anirban was not able to win for the second time but took the positives from an impressive week.
He said: “I’ve been trying to get some momentum going all week and get some rhythm all week but it’s been a struggle. I’ve had to fight my swing all week but on the back nine I told myself that if I could get through 12 and 13 and make a couple of birdies, the back nine is always a bit dicey. I was hoping to get within touching distance and giving him a bit of a scare and put pressure on him.
“It’s been a struggle the last few months but I can’t say I’m playing my best golf either. But when it comes down to getting it done. You go into these trains of mind and you don’t see anything else but the bottom of the cup. Today was like that. It was similar when I shot 11 under here two years ago and similar when I won the Malaysian Open last year down the stretch.
“I’m happy with the way I played the back nine but disappointed that I finished second again. Hats off to Pavit. Even in the play-off he played solid and he played solid all day. I wish I could have put more pressure on him. I did everything in my power but sometimes it doesn’t happen for you.”