Tom Glavine -- Can I Still Fire a Baseball? YOU BET YOUR ASS!

He's set to be inducted into the Hall of Fame ... but MLB pitching great Tom Glavine tells TMZ Sports ... he can still bring the heat when it comes to rocketing a baseball.

The 47-year-old was at LaGuardia on Wednesday when we asked him if he's still maintaining his arm -- 5 years after he retired from the game.