Lahiri carded a four-under 68 to move to nine-under 207 for 54 holes.
The leader was Filipino Miguel Tabuena who shot into the lead with a sensational seven-under-par 65. One behind him besides Lahiri is Asian Tour legend Thaworn Wiratchant (68).
In tied fourth are three stalwarts Daniel Chopra 69), Veteran Yeh Wei-Tze (65) and Prom Meesawat (68) at eight-under 208.
Chiragh Kumar made a handy move upwards with a round of 69 and he was tied 10th at two-under 214. Jyoti Randhawa had a rough back nine with three bogeys and his card of 74 saw him slide to tied 46th, down from overnight 26th.
Lahiri feeling the effects of jetlag posted six birdies and one bogey after 13 holes but lost momentum when he bogeyed hole 16. Then he had three pars.
Talking about his recent travels, he added, "I came in on Tuesday afternoon from the Switzerland so I had trouble sleeping. I probably had 15 hours of sleep in four days. I felt the heat on the back nine today and felt a bit low on energy. I am going to go back, rest up and come back tomorrow."
Title holder Thaworn, who birdied the last hole, and Lahiri, ranked second on the Order of Merit, posted matching 68s to tie in second place at the US$500,000 Asian Tour event.
