A Moonball in tennis is a high, looping shot with lots of topspin. It's usually hit with a forehand stroke.
Moonballs travel slowly through the air and bounce high after landing. They often land deep in the court, near the opponent's baseline. Players use moonballs to disrupt their opponent's rhythm and timing.
This shot can be effective on clay courts where the high bounce is amplified. Moonballs can be challenging to return, especially for shorter players. They're sometimes used as a defensive shot to buy time during a rally.