Tennis

Tennis is a racquet sport played on Earth.

K-9 erased all his knowledge of tennis from his memory banks, when he followed Romana's instructions to "forget it" literally. (DW: The Stones of Blood)

Jack Harkness was seen trying on a tennis outfit complete with racquet for a tv show but did not seem to like it claiming it was 'too safe'. (DW: Bad Wolf)

The Doctor used a tennis racquet to hit General Staal's Probic vent. (DW: The Sontaran Stratagem)