Chawrasia, who took his three-day total to two-under 211, was looking set for a top-15 finish but two closing bogeys forced him to settle for a 69.
Lahiri continued his struggle and posted 75 -- his worst score in three rounds. His 54-hole total stands at nine-over 222.
The round is yet to be completed with almost half of the 60-man field still on the course.
Chawrasia build on his opening-hole birdie and made birdies on the fifth and sixth before playing a bogey on the seventh. However, he remained unflustered and bagged another birdie on the ninth hole to sit at three-under in the front-nine.
In the back-nine, even though he got a bogey on the 11th, he roared back with birdies on the 13th and 14th.
But bogeys on the par-three 17th and par-five 18th pulled him down to two-under till the 54 holes as he completed the third with a score of 69.
Lahiri once again struggled as he got off to a poor start by getting a bogey on the second hole. He fought back to get a birdies on the next hole but a double bogey on the par-three fourth hole affected him.
Three more bogeys on the seventh, ninth and 14th was followed by a birdie on the 16th as he settled for a 75.
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