It was the first tennis game on the NES and allowed to play singles or doubles against five different levels of enemies. Although there aren't many moves to remember, it actually takes time to master the game and defeat the toughest and fastest opponents. Practicing volleys and smashes might help you tremendously if you want to win the last tournament.
A familiar Nintendo character makes a guest appearance in the umpire's chair. He performed a similar profession in a few other Nintendo sports games; can you find them all?