A pro racquetball player would also have very good footwork, besides the excellent hand/eye coordination. In fact, they would have even better stamina than a normal 3.0 player would.
So have the player come out and play a few times ... you'll see how quickly they improve. Then ask yourself this question:
Would I want to be playing against this person? Do I have a chance beating this person 6 months from now?
If the answer is "yes," that person should be at your level. If the answer is "no," then it would be inconsiderate and unsportsmanlike to allow that player on your team.