All Star Tennis 99 is a tennis simulation game for the Nintendo 64 featuring eight professional ATP and WTA players, including Mark Philippoussis and Conchita Martinez, alongside four fictional characters. Players can compete in various tournaments across different surfaces such as grass, clay, and hard court. The game offers modes for singles and doubles matches, supporting up to eight players in multiplayer tournaments.
Play as 8 world class ATP / WTA tour players (including Mark Philippoussis, Richard Krajicek, Conchita Martinez & Jana Novotna) as well as 4 fictional players through a range of tournaments on grass, clay, hard court and rebound ace surfaces.
Lob, volley, smash and serve past computer controlled players in singles or doubles, 4 player multiplayer doubles, and 8 player multiplayer singles and doubles tournaments.