Virtua Tennis

All players:
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To get the "Other Tennis Players" click on "Exhibition". Then, enter 
one of the following codes and press [Enter] at the player selection 
screen to unlock the corresponding player.

NED
SUI
CRO
CAN
IND
BRA
ITA
JPN 

King:
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Successfully complete the entire World Circuit.

Master:
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After completing the World Circuit, play Arcade mode with one game per 
set under the normal, hard, or very hard difficulty setting. When you 
win the final, the next challenger will be Master.