Tennis

Tennis was a racquet sport played on Earth. The sport had three variations, none of which Romana was familiar with: real, lawn and table tennis. K9 erased all his knowledge of tennis from his memory banks when he followed Romana's instructions to "forget it" literally. (TV: The Stones of Blood)

Later in the Doctor's life, 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'. (TV: Bad Wolf) Still later, the Tenth Doctor used a tennis racquet to hit General Staal's Probic vent. (TV: The Sontaran Stratagem)