Super Mario plays a lot of sports. He hosts parties. He even races go karts at unsafe speeds and beats the tar out of his friends for fun. The best part about all of these hobbies is that most of them have made for some super fun video games. The baseball one is kind of bad, but... well, it's baseball. There's only so much you can do with baseball.
There are still a lot of sports out there that haven't seen the Mario treatment, or at least been featured as a single, solo video game project. At the same time, there are probably a few really lame sports that not even Nintendo magic could salvage. So, our boy Mario should probably just not even bother.
Check out this list of sports that would make for cool Mario games, and a few that probably wouldn't.