- T: The spot on a tennis court where the center line and the service line intersect perpendicularly to form a "T" shape.
- tank: To lose a match because of poor mental game; or to purposely lose a non-vital set, so as to focus energy and attention on a match-deciding set.
- tape it: To play an unforced error that hits the tape at the top of the net.
- tennis ball: Soft, hollow, air-filled rubber ball coated in a synthetic fur, used in the game of tennis.
- tennis bubble: Indoor tennis facility consisting of a domed structure which is supported by air pressure generated by blowers inside the structure.
- tennis dad: Father of a tennis player, often used in reference to a parent actively participating in the player's tennis development and/or career.
- tennis elbow: Common injury in beginner to intermediate tennis players, possibly due to improper technique or a racket which transmits excessive vibration to the arm.
- Tennis Hall of Fame: International Tennis Hall of Fame located in Newport, Rhode Island; it hosts an annual tournament around the inductee ceremony.
- tie: Synonymous with match, but used for the Davis Cup.
- tiebreak: Special game played when the score is 6–6 in a set to decide the winner of the set; the winner is the first to reach at least seven points with a difference of two over the opponent.
- topspin: Spin of a ball where the top of the ball rotates toward the direction of travel; the spin goes forward over the top of the ball, causing the ball to dip and bounce at a higher angle to the court.
- touch: Occurs when a player touches any part of the net when the ball is still in play, losing the point.
- tramline: Line defining the limit of play on the side of a singles or doubles court.
- trampolining: Effect which occurs when striking a ball flat with a racket that is strung at a very loose tension. Trampolining results in a shot that has a very high velocity.
- tree: Player who is playing much better than normal, or a shot that a player hits that he/she would not usually make.
- treeing: Someone who is playing much better than normal.
- triple bagel: Three sets won to love. See bagel.
- triple crown: Winning the championship in all three tennis disciplines (singles, doubles and mixed doubles) at one event, especially a Grand Slam tournament.
- tweener: Trick shot created by Guillermo Vilas which involves hitting the ball between the legs from front to rear while retrieving an offensive lob. See also hot dog.
- twist serve: Serve hit with a combination of slice and topspin which results in a curving trajectory and high bounce in the opposite direction of the ball's flight trajectory. See also kick serve.
- two ball pass: Passing an opponent that has come to the net with a first shot that causes them trouble on the volley followed up by hitting the second ball by them.
Read more about this topic: Glossary Of Tennis Terms