First, choose a one set game, play the sea-cup and enter one team or two human players. When it's your turn to serve, move the non-serving player up to the top of the court close to the net, which'll force one of the computer players to follow him. Now do a jump serve (push 'Up' and 'Fire'), then hit the ball to the other computer player by pushing 'Right' then 'Down'. The ball should drop between him and the net and he should miss the ball. Hopefully this plan should work. It may not work with the other teams such as Coco, Freaks, etc., but it works with the Rollers and the Golden Boys.