I too will repeat some advice I have offered on here numerous times. Make sure your son is preparing for and running the sixty in a way that leads to the best times. At my son's two Perfect Game events for example I noticed that he and maybe only five other guys were really doing some stretching and practice starts while most of the guys were standing around yakking. Get right up to the start line and run seventy yards hard. Notice I said seventy yards not sixty. I saw numerous guys slow down before the end of the sprint. They lost probably a couple of tenths of a second right there. If he can and they run in pairs, purposely pick someone faster than him so that he will be forced to run all out to try to beat the other guy.
DON'T RUN SIDEWAYS!!! I see so many guys that don't run straight through the track. They use energy and actually run a longer distance.
EXPLODE on the start!! Be low and come up as he runs the first twenty yards or so.
Arm movement especially side to side can really cost a runner precious time.
Leaning back as the player is running is not good technique either.
Be in shape to sprint! Those ten extra pounds around the middle or on the back on the thighs don't help.
Have the legs ready to run and run hard!
I honestly feel many guys can improve their time if they just work at learning HOW to prepare and run. Both my sons ran both high school and AAU track and the younger opted for track over baseball in college.