puzzle 250: "game one"

[Erik Agard]

It’s game time! This will be a best-of-five series, with one game every day between today and Monday. All you have to figure out is:

1. Who’s playing?
2. What are they playing?
3. Who wins the series?

To check answers, request hints, report errata, and so forth, email me at cruelandu...@gmail.com. Good luck!

PS: Thanks to joon pahk, who tested these puzzles and made them better.