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Dreamcast - Virtua Tennis cheats

Master in singles, Master and King in doubles as your opponents:
Play through the arcade mode withouth using a single continues.
Do not lose a round in normal difficulty level.

Unlock King as playable character in arcade and training modes #1:
Beat Master in arcade mode in singles. After, 
beat King and Master in doubles in arcade mode

Unlock King as playable character in arcade and training modes #2:
If play in world circuit mode and complete all 24 training and 22 trial 
levels you will unlock King also.

Unlock Master as playable character in arcade and training modes:
Beat Master in singles in arcade mode.

Perform Master's underarm serve: 
while at near court - Press A + X + Down
while at far court - Press A + X + Up