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Sorry, you can't. But you can play with a computer
You may want to re-word your question by addressing the game that you are talking about in your question. The Wii is a console, not a game, and it doesn't have Tennis, but there are many games for the Wii that have Tennis, but, for example, you can't play tennis with just two people on Wii Sports. So distinguish what game you are talking about.
In Bowling you don't. Tennis you do. Baseball you do. Boxing you do, and you also need a second Nunchuck.
No, Wii sports does not support any kind of wi fi connection, and is played only by you.
Yes, it can be played in two-player mode by using only two gamepads. You cannot play it using a keyboard and a joystick. As soon as you plug in your second gamepad, the 2P option will be available.