Nooooo bro. Please don't do this...
Go on the date first. If this sports thing isn't a date, and there's friends involved, then schedule another get together later on where it's just you and her. Even with the sports idea you can get some kino in, get her comfortable with your touch.
On the actual date, escalate, make some sexual stuff happen (not sex, but maybe some hand holding, cuddling, even kissing).
Then, when you KNOW 100% that she's interested and wants to be "exclusive", ask her out, if she hasn't already asked you out. But be up front about it, to her face. No notes, no texts, always to the face.
Good luck, bro.