Island Open

The Island Open is the big tournament in Mario Tennis and Mario Tennis: Power Tour. The tournament itself is divided into singles and doubles tournaments between the Academy, Factory, Empire, and Union. In the Game Boy Color game, the amount of students from each school was uneven, but that was changed in the Game Boy Advance game.

Singles Players by School (Game Boy Color):

Academy
 * Alex or Nina
 * Emily (she is a semifinal opponent)
 * Kevin (he is never faced)
 * Mark (he is not faced in the tournament)

Factory
 * A. Coz (he is a final opponent)
 * B. Coz (he is not faced in the tournament)
 * Frank (he is never faced)

Empire
 * Spike (he is a round 2 opponent)
 * Ellis (is never faced)
 * Elden (he is not faced in the tournament)

Union
 * Sammi (she is a round 1 opponent)
 * Sean (he is not faced in the tournament)

Doubles Teams by School (Game Boy Color):

Academy
 * Alex or Nina, Harry or Kate
 * Kevin, Emily (is not faced in the tournament, Kevin is never faced)

Factory
 * A. Coz, B. Coz (final opponents)

Empire
 * Spike, Elden (they are semifinal opponents)
 * Ellis, Edgar (is never faced)

Union
 * Sammi, Sean (they are round 1 opponents)

Singles Players by School (Game Boy Advance):

Academy
 * Clay or Ace
 * Elroy (he is a semifinal opponent)
 * Whisker (he is not faced in the tournament)

Factory
 * Willy (final opponent)
 * Sheri (is not faced in the tournament)
 * Sass (she is a round 2 opponent)

Empire
 * Dweezil (he is not faced in the tournament)
 * Mynx (not faced in the tournament)
 * Barb (round one opponent)

Union
 * Chas (not faced in the tournament)
 * Mel (not faced in the tournament)
 * Leon (never faced)

Doubles Teams by School (Game Boy Advance):

Academy
 * Clay and Ace
 * Elroy and Tori (is not faced in the tournament)

Factory
 * Willy and Sheri (are final opponents)
 * Sass and Chet (not faced in the tournament, Chet never faced)

Empire
 * Dweezil and Mynx (semifinal opponents)
 * Barb and Oscar (not faced in the tournament, Oscar never faced)

Union
 * Chas and Mel (are round one opponents)
 * Leon and Peter (are never faced)