Mason

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." He thinks he's much better than he really is, and claims that Clay's or Ace's unorthodox style of playing is why his "phenom powers" didn't 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 only applies the title to your character(s), although he gets some of that overconfidence back when he finally learns a Power Shot, which his partner laughs off. His doubles partner is Chad.