The Indian, who was having a share of the lead with the eventual winner Justin Thomas and Marc Leishman, faltered over the last five holes with two bogeys and a crippling double.
He dropped from two-under to two-over for the day and from 9-under to 5-under for the tournament and finished Tied- 5.
Lahiri finished in a six-way tie for fifth place alongside last week's winner at CIMB, Pat Perez (68), Jamie Lovemark (71), Brian Harman (71), Luke List (72) and overnight co-leader Scott Brown (76).
"That is two disappointing Sundays in a row. But I am happy to see the game trending in the right direction. Lets try again," Lahiri said later.
Justin Thomas, who has been unstoppable from the time he snatched the CIMB Classic from under Lahiri's nose 12 months ago in 2016, won yet again.
He edged out Marc Leishman on the second play-off hole after both players birdied the 18th. Actually, Thomas almost eagled for an outright win in regulation play.
Patrick Reed (70), Jason Day (71) and Rafa Cabrera Bello (71) and An Byeong Hun (73) were tied 11th.
The start in the morning was dramatic as Thomas double bogeyed the third and co-leader Scott Brown double bogeyed back to back on fifth and sixth. In contrast, Lahiri birdied on third.
In the group ahead, Leishman had a birdie-birdie start, but bogeys on fifth, seventh and eighth meant he dropped back, too.
Thomas recovered his lead on back nine with birdies on 10 and 11, but Lahiri birdied 12th. Leishman birdied 12th and 14th and the battle became tighter. But Thomas again opened the door once again with a bogey on 13th.
Over the last five holes, as tension heightened, Lahiri faltered. He bogeyed 14th and made it worse with a double on 15th, where he failed with a chip on his third shot. Thomas and Leishman parred till 16th.
On the 18th, Lahiri's last chance was an eagle while hoping for only pars from his playing partners. Lahiri ended with a bogey, Thomas missed an eagle putt but got his birdie and Leishman calmly birdied. Lahiri fell to 5-under, while Thomas and Leishman went into a play-off at 9-under.
Thomas then birdied on second play-off hole to win his third PGA Tour title in Asia.
Disclaimer: No Business Standard Journalist was involved in creation of this content
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