Batting slump

Stand closer to the plate.  Sometimes a solution is easier than one thinks and doesn't require hitting instructors, videos and over analysis.

2nd sentence may come across harsher than intended, but I'm a fan of not over-thinking things.  Keep in mind, I'm a father of a PO, but same approach applies to pitching mechanics.

Good luck.

If he's killing it oppo in practice, sounds like it's probably just a timing or balance issue.  A couple thought processes he can play with during tee work and BP are "drive it thru the 3-4 hole" and "don't let the barrel head get below the ball" at any point in the swing.  This latter part goes against some hitting philosophies, so buyer be ware.  The idea is to negate the tendency for the barrel to drop on pitches away.

Another mechanic to watch for is that the hips should not fully open to the extent they do with pitches middle, middle in.  And, it helps if there is deliberate effort to allow the head to stay thru the ball a bit longer, as you mentioned.

Mixing live BP with mixed speeds and focus away along with the tee and front toss work should help him get back on track.

If he is crushing everything middle in then maybe that is the problem? Is he ever late on those pitches? Is he ever really early on those pitches? Nothing changes in the swing. When you swing is what matters. I like to see a kid late from time to time. Not because he is over matched. But because he is letting the ball travel and he just happened to let it travel a little too much. If your guy is never late then he is always on time or early. Chances are he's never always on time. So why is he never late? Bat speed is a tool that can either be used to your advantage or used against you. Let the ball travel. Learn this "It's ok to be late." Just not to practice. 

Does he have a long swing? Is he trying to pull everything? Is he coming around the outside pitch to pull it? Maybe he’s not hitting the ball where it’s pitched. Maybe he needs to take the outside pitch the other way.

It’s hard to know for sure without seeing swing. Everything posted so far is a viable answer without seeing his swing.

Thanks for the feedback.   He been evaluated several times and he's always been praised for having "quick hands" and he does a good job of staying inside the ball. In other words he never pulls the outside pitch and utilizes the entire field.   Perhaps he's early on the outside pitch sending it in the air?  He's taking the ball where it is pitched but he's just not hitting that hard line drive to right center he has in the past.   Everything is a pop up to second base or fly out to right field.   It's driving us both nuts.   

Video his in game at bats. Where is the outside or middle away pitch when he makes contact, is he opening up the hips too early - etc. Video is excellent when attempting to not only see for yourself but more importantly allowing him to see. Use your smart phone I know you have one.

4arms posted:

...he does a good job of staying inside the ball. In other words he never pulls the outside pitch and utilizes the entire field.   ... He's taking the ball where it is pitched but he's just not hitting that hard line drive to right center he has in the past.   Everything is a pop up to second base or fly out to right field.      

IMO, this isn't about timing, and isn't about a swing flaw.  It's about intent to rip.

Probably, when he hit a rough patch for a few games, he started feeling for the outside pitch, like a blind man with a cane.  It's a common pitfall.  Solution is to let it rip.