Hobby is at 10-under-par 203 through three rounds at the Country Club of Hershey. Hes one-shot clear of overnight co-leader John Rollins. Rollins led by two shots at 12-under, but bogeyed the 15th and doubled the par-3 16th to shoot a 2-under 69.
Fellow 36-hole co-leader Rob Bradley is now five shots off the pace following a 2-over 73.
Hobby, currently 47th on the money list, shot 32-32 to tie his career-low round on the Buy.Com Tour.
Brad Klapprott moved into third place at 6-under with a third-round 64. Steve Haskins (67), Kelly Grunewald (67) and David Gossett (69) are all tied with Bradley for fourth place at 5-under.
Full-field scores from the Buy.Com Hershey Open