ARDMORE, Pa. -- Never mind that Husky sophomore Cheng-Tsung Pan is currently leading all amateurs at the 2013 U.S. Open. Pan, who was a PING first team All-American, is holding his own against the professionals at Merion Golf Club in Ardmore, Pa. and is one shot off the lead.

Granted, Pan has made it only halfway through his second round, but he was 2-under on the day and has moved into a group of who's-who leaderboard. Pan birdied the par-5 second hole and the par-4 fifth hole and had seven pars before darkness forced him to the clubhouse.

Phil Mickelson and Billy Horschel share the lead at 1-under. Pan and four others -- Luke Donald, Steve Stricker, Justin Rose and Ian Poulter -- are even for the tournament.

Currently the cut line sits at +8. The other Husky amateur competing this week, Chris Williams, has completed 36 holes and is +9.

Williams wrapped up his first round in the morning and immediately teed it back up for his second round. The Hogan Award Winner was 1 under when darkness set in Thursday, but he struggled when he picked it back up. With eight holes to play, he bogeyed five of his first six holes -- doubled-bogeyed the other hole -- and finished with a birdie to end up 5-over 75.

Williams shot 74 in his second round to get into a tie for 87th with a two-round total of 149.

Currently, 86 golfers are projected to make the cut and advance to third and fourth round action Saturday and Sunday.