Knicks Star J.R. Smith — Killin’ The Competition … At Secret NYC Pick-Up Game

It was Knicks DOMINATION at a bolt from the blue pick-up game in NYC today — when Carmelo Anthony and J.R. Smith went HAM on some NBA competition at a gym in the Huge Apple … and TMZ Sports has the footage. 

It went down at Terminal 23 — an elite b-ball facility in Manhattan — where the Knicks players balled with fellow NBA stars Lance Stephenson, Davis Lee and Chris Douglas-Roberts. 

But the man who stole the show was J.R. — who thew down a pair of nasty dunks … including an impressive 2-handed reverse tomahawk. 

We’re told J.R. and Melo played on the same squad during the game — and unlike most of last season, they really emerged victorious. 

Maybe exchange really does start in the gym.