Mason ​is a character in Mario Tennis: Power Tour. He holds the third rank in the Junior Class at the Academy and is convinced that he's a "tennis phenom", and in singles mode, he refers to himself as "yours truly". As a result, he is overly confident and claims that Clay's or Ace's unorthodox style of playing is why his "phenom powers" did not kick in and win the ranking match for him. After Clay or Ace goes high enough in the standings, he starts referring to them as "phenoms" as well, possibly to live his dream through them. Eventually, he stops calling himself a phenom and applies the title only to the player character(s), although he regains overconfidence when he finally learns a Power Shot, which his partner laughs off. His doubles partner is Chad.

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