Odell Beckham's going to KILL IT with the Browns this season ... so says his former N.Y. teammate, Victor Cruz, who tells TMZ Sports, "He's going to ball."
Odell was just traded from the Giants to Cleveland a few months ago ... and Victor has no doubts the superstar wideout is going to find big success with the Dawg Pound.
In fact ... Cruz is predicting DOUBLE-DIGIT wins for Cleveland now that OBJ is wearing a Browns jersey -- telling us he's confident Baker Mayfield "has got all the tools" to feed the wideout.