Chris Crawford said he did not realize his caddie had been using an illegal feature on his laser measuring device.
Crawford discovered his caddie activated the slope feature on a distance-measuring device, a rules violation.
The former Drexel star and current Dragons assistant coach hasn't qualified for match play in four previous tries at U.S. Amateur
Kisner shot 67 in the second round en route to a tie with Hideki Matsuyama in the second round of the tournament in Charlotte.
The 19-year-old sophomore-to-be at Bucknell shook off a double bogey on the 13th hole and sank a clutch birdie putt at the 17th for the win.
The sophomore at Bucknell carries a 1-stroke advantage into Thursday's final round. Four former champions are in contention.
The head pro at Applebrook Golf Club in Malvern, McNabb, 51, is competing this week at the Quail Hollow Club in Charlotte, N.C., in the season's final major.
After some down years, the Chadds Ford golfer is once again having a decent season on the tour.
The Penn State player deals with a surprise downpour to tie for 36-hole lead; teammate and defending champion Miller one stroke back.
Two weather delays totaling almost 2 1/2 hours made it tough for the 125 contestants to complete 36 holes before dark, but somehow they succeeded.
The Texan put together a closing performance that ranks among the greatest finishes in major championship history.
Matt Mattare didn't find the going nearly as easy as he did on Monday when he shot a course-record 63, but a clutch putt at the 16th hole helped him clinch the victory in the Golf Association of Philadelphia major.
Saucon Valley's Matt Mattare fashioned one of the best stroke-play rounds in Golf Association of Philadelphia history, a 63, to lead the Philadelphia Open by four shots with one round to play.
The amateur may have fallen short of becoming the youngest player ever to win a major championship, but she showed plenty of poise finishing in second place.