Squash is a racquet sport played by two players (or four players for doubles) in a four-walled court with a small, hollow rubber ball. Squash is recognized by the IOC and remains in contention for incorporation in a future Olympic program. The game was formerly called squash racquets, a reference to the “squashable” soft ball used in the game (compared with the fatter ball used in its parent game Racquetball.