The gameplay in Grand Slam Tennis is varied, with several modes to choose from. The main career mode allows players to customize their characters and then compete in each of the four tournaments to win the Grand Slam. Other game modes include Party mode, where players can participate in mini-games for one to four players; Play Now, which enables quick games for up to four players; and Online mode, where players can compete against each other in ranked or unranked matches, with leaderboards displaying player rankings.