Chawrasia dropped three bogeys, a double bogey against five birdies on the second day to aggregate 142, while Lahiri totalled 147 at the half-way stage after dropping five bogeys and three birdies.
Rio de Janeiro: An erratic SSP Chawrasia brought home a second successive even-par 71 to lie tied 30th while Anirban Lahiri carded a disappointing two-over 73 to be placed tied 51st after the second round of the golf event at the Rio Olympics here today.
Chawrasia dropped three bogeys, a double bogey against five birdies on the second day to aggregate 142, while Lahiri totalled 147 at the half-way stage after dropping five bogeys and three birdies today.
At the top, Australia's Marcus Fraser brought home a sedate two-under 69 to continue to be the leader at the half-way stage with a total of 10-under 132.
One stroke adrift was Belgium's Thomas Pieters (66) followed by Swede Henrik Stenson (68) with a total of 133 and 134 respectively.
Birdies and bogeys flew in equal measure from Chawrasia's club as he dropped a bogey and a double bogey in the second and third holes respectively before firing a couple of birdies in the fourth and fifth to make amends.
The Kolkata golfer then produced a birdie-birdie finish to make the turn at one-under.
On resumption, Chawrasia stumbled again at the 10th and 11th holes to go one over before managing a birdie at the 17th to finish even-par.
Lahiri, on the other hand, had a forgettable second round as his day went from bad to worse. The Asian tour No. 1 dropped four birdies and a long birdie in the front nine to make the turn at three-over.
He again dropped a bogey at the 14th hole before a couple of birdies on the 16th and 18th holes helped him to end the day on a positive note.
Chawrasia and Lahiri had started with even par 71 and three-over 74 respectively to be placed 27th and 50th at the end of the first round yesterday.