Well, 6'3" tall should still allow for good footspeed and movement.
6'5" might be starting to show some clumsiness or lack of coordinated footwork, leading to possible injuries in the long run.
5'11" is well within reason for athletic movement and quickness in all directions.
5'7" should be solid footwork and explosive possible speeds.
5'3" should have good enough movement, but lack of reach.
Given a choice, I'd rather play tennis at 6'4" than any other height.