Chuck and Phil are going head-to-head with Steph Curry and Peyton Manning for "The Match 3" charity golf outing -- raising money for historically Black colleges and universities -- and Phil tried to give his teammate extra incentive to hit a good shot.
Mickelson told Barkley he's tired of his "NBA on TNT" colleagues disrespecting him -- most notably Shaq -- so it was time for a little payback.
Unfortunately, Charles didn't follow up with a hole-in-one, but didn't hit a bad shot either ... which has been the story of the day so far.
Chuck -- who's known to have a notoriously bad hitch in his swing -- has been swinging pretty smoothly ... and he and Phil are currently up 3 through 9 holes of the 18-hole showdown.
Barkley did just shank one though ... so ya gotta think Shaq's still got a good chance at getting the last laugh.