Is Mario Tennis on Steam?

No. Mario Tennis is not distributed on Steam, so there is no Steam Charts or SteamDB player count for it. Its live popularity is tracked here via Twitch viewership instead.

What platforms is Mario Tennis on?

Mario Tennis is available on Wii, Nintendo 64, Wii U.

When did Mario Tennis release?

Mario Tennis was first released on July 21, 2000.

Mario Tennis

Jul 21, 2000SportWii Nintendo 64 Wii U

Mario Tennis — frequently asked questions

Is Mario Tennis on Steam?: No. Mario Tennis is not distributed on Steam, so there is no Steam Charts or SteamDB player count for it. Its live popularity is tracked here via Twitch viewership instead.
What platforms is Mario Tennis on?: Mario Tennis is available on Wii, Nintendo 64, Wii U.
When did Mario Tennis release?: Mario Tennis was first released on July 21, 2000.

About Mario Tennis

All of your favorite characters hit the court in a wild and wacky multiplayer tennis game from the makers of Mario Golf. Mario, Luigi, Bowser, Peach, Toad, and Donkey Kong lead off the all-star, 14-player line-up. The fast-paced action will have you unleashing vicious volleys, life-saving lobs, ballistic backhands and electrifying super-charged smashes!

Summary via IGDB.