I printed the tennis ball in PLA + which bounces well and hasn't broke so far.  one thing that I'd recommend is to print with a layer hight of 0.16 to 0.12, it makes the balls last longer. but i wouldn't go below this as the balls i printed whit a layer hight of 0.1 and 0.08 made them to less impact resistant (not shore if that is the correct wording) which caused then to break easily. use default supports and If you can i would try not to have any supports go up into the ball as they can get stuck inside.