Virtua Tennis 3
Select Tournament mode and win a Singles match with a "C" or better rank. You will then get challenged by Duke. Defeat Duke to unlock him as a playable character. To easily play against him, set the options to 1 set and 1 game, and the difficulty to Easy. Play a Singles match and do very good by getting A's and B's to get a challenge from Duke.
Select Tournament mode and win a Singles match with a "D" or worse rank. You will then get challenged by King. Defeat King to unlock him as a playable character. To easily play against him, set the options to 1 set and 1 game, and the difficulty to Easy. Play a Singles match and do very bad by getting C's and E's to get a challenge from King.
Get three strikes in a row in the Pin Crusher mini-game to unlock the Frying Pan racket.
Defeat Duke or King in a SPT final to unlock the Guitar racket.
Make a total of 100 lob shots to unlock the Tambourine racket.
Win King Of Players mode to unlock the Wooden racket.
In Career mode, play the "Defend The Prize" mini-game repeatedly. Choose one prize and stand in front of it (ignore the others). Simply defend that one prize to easily win the mini-game every time and be able to increase your Volley skill as quickly as desired.