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,…