Willy is one of the Royal Tennis Academy students in Mario Tennis: Power Tour. His doubles partner is Sheri. Willy's Offensive Power Shot is the Summoner Shot and his Defensive Power Shot is the Hand-Power Save. He has two older brothers, A. Coz and B. Coz.
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| Characters | Default | Ace • Bowser • Clay • Donkey Kong • Luigi • Mario • Peach • Waluigi |
| Unlockable | Chad • Chris • Elroy • Emi • Flit • Kyle • Kyoko • Linda • Mason • Meg • Mynx • Gary • Jet • Emi • Roy • Paula • Shawn • Sheri • Skipper • Sophia • Sylvia • Whisker • Willy | |
| Non-playable | A. Coz • Alex • B. Coz • Chet • Emily • Harry • Headmaster • Mark • Nina • Kate • Kevin • Leon • Oscar • Peter • Samantha • Shadow Swing King • Shadow Swingstress • Great Fairy of Victory • Toad • Toadsworth • Pianta • Noki | |
| Courts | Courts | Clay Court • Composition Court • Grass Court • Hard Court • Peach Dome |
| Locations | Locations | Empire • Factory • Island Open • Mario World • Royal Tennis Academy • Tennis Academy Restaurant • Tennis Academy Training Center • Union |
| Power Shots | Offensive | Barrel Cannon Blast • Blizzard Shot • Dragon Shot • Gyro Shot • Iron Hammer • High-Power Shot • Control Shot • Fire Breath • Flying Shot • Flashflop Shot • Summoner Shot • Super Peach Spin • Sonic Shot • Specter Shot • Squeaky Mallet • Stunner Shot • Tackle Shot • Whirluigi • Volcano Shot |
| Defensive | Boomerang Banana Return • Bubble Save • Falcon-Dive Save • Hand-Power Save • High-Jump Save • Illusory Save • Poltergust Return • Running Save • Quick Save • Quick-Step Save • Rainbow Save • Superswift Save • Spider Save • Shark-Bite Save • Shooting-Star Save • Spin Jump Return • Spinning Shell Dash • Sweet Kiss Return • Swimming Return • Typhoon Save | |
| Miscellaneous | Minigames | Bicep Pump • Duck Walk • Instinct Drill • Jump Gym • Reflex Rally • Rope Climb • Swift Spin • Tacklebot • Tennis Machine • Tightrope • Treadmill • Wall Practice |
| Schools | Empire • Factory • Royal Tennis Academy • Union | |
| Other | Gallery • Quotes | |