The smallest regulation sport ball is the ping pong ball (40 mm diameter). Since the change from a 38 mm competition ball, there are squash balls that are smaller, but these can vary from 39.5 to 40.5 mm in diameter.
The Golf ball is slightly larger at 42.67 mm (increased in 1960 from 41.15 mm).
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Doubles Table Tennis takes about 20.25 square feet per person. Given that upper-level players play about three feet back from the table, the total playing area is 81 square feet. Divided by four, this gives us 20.25 square feet per person at the highest level of play. This is less than sports such as four-square, which requires 100 square feet per player for adult play. Diving could conceivably take less space, but not using a regulation diving pool.
I belive the sport with the smallest court is table tennis, If i am wrong i am sorry.Please someone edidt the answere if i am wrong.