Arjun Atwal turned in an improved card of one-over 71 in the second round but that was not enough as he failed to make the cut at the AT & T National on the PGA Tour here.
The Orlando-based golfer, who carded a poor seven-over 77 in the first round, had a two-day total of 148, while the cut was decided at 143.
An 18th hole bogey was the lone blot in his card on Saturday but he paid the price for a bad first day at the Aronimink Golf Club to fall by the wayside.
At the top, South Korean K.J. Choi equalled a course-record with a six-under par 64 to seize a two-stroke lead after the second round of the USD 6.2 million event.
Choi's countryman Charlie Wi and Americans Justin Leonard, Chris Riley and Bo Van Pelt shared second on 135. Americans Kyle Stanley, Jeff Overton, Bryce Molder and Charles Howell shared sixth on 136.