| Gallery | The spectator area at the ends and sides of a court. By extension, the spectators, as in, "The gallery really applauded that shot." |
| Game | A contest in which one player or side serves throughout. The first contestant to take four points wins the game, but the margin of victory must be at least two points. Scoring follows the sequence, Fifteen-Thirty-Forty-Game. If both players or sides reach forty, it's called deuce. See also advantage; deuce; set; match. |
| Game point | A point that will end the game if it is won by the leading player or side. See also set point; match point. |
| Game-set | Part of an announcement that a player has won the decisive game in a set, as in, "Game-set to Miss Jones." |
| Game-set-match | Part of an announcement that a player has won the decisive game in a match, as in, "Game-set-match to Miss Jones." |
| Grand Slam | There are four tournaments in the "Grand Slam" of tennis: The Australian, French, U. S. Open and England's Wimbledon. The phrase came from contract bridge by way of golf. |
| Groundstroke | A shot hit from the back court or behind the baseline after the ball has bounced; the standard shot in tennis. |