Anirban Lahiri

After turning in 35 with a birdie on two, the former Asian No. 1 endured a rollercoaster back nine with three birdies, three bogeys and one eagle at TPC San Antonio for a two-day total of 4-under 140. Japanese star Hideki Matsuyama came home in 74 to slip to T14 while Korea's Sung Kang will enter the weekend on 142 after returning a 76, some 10 shots worse than his opening round effort.