You can play it together from one Nintendo Switch console, join a friend online, or match up with similarly-skilled players from around the world.
☆ NintendObs Weekly – Monday, November 26, 2018 – Sunday, December 2, 2018.
Directly to you from Twitter:
…Wanna play? Buy a Switch.
And if you’ve already got yours, click on Mario Tennis Aces for everything you need to know about the game. 😀