Screenshots and details for Mario Tennis Aces have popped up online via retailer Rakuten ahead of tonight's Nintendo Direct.
The game's product page lists a 22nd June release date for Mario's sporty Nintendo Switch game - at least in Japan. (It's likely the same here.)
Images confirm the usual roster of characters you'd expect to be playable, including Mario, Wario, Waluigi, Daisy, Rosalina, Yoshi, Donkey Kong and Bowser.
It sounds like you'll be able to play by swinging the Joy-Con, which is very Wii Sports Tennis. There will also be online play and local co-op.
Nintendo's Direct broadcast is scheduled for tonight at 10pm UK time. We'll be reporting live.