Mason
From the Super Mario Wiki
Mason (Japanese: マサル Masaru) is a character in Mario Power Tennis. 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." He thinks he's much better than he really is, and claims that Max's or Tina's unorthodox style of playing is why his "phenom powers" didn't kick in and win the ranking match for him. After Max or Tina goes high enough in the standings, he starts referring to them as "phenoms" as well, possibly to live his dream through them. His doubles partner is Chad.

