What approach do you take if a waitress is checking you out at a sports bar? (Whom isn’t assigned to your table)

She’s obviously legal if she working behind a bar, chat / small talk / flirt

Have you never been to a sports bar?

I try a small talk to figure out whether she's worth my time or not

I wouldn't leave a tip and then see if she still checks me out next time. She is probably just looking for a sugar daddy.

One option would be to drop trou...
Not recommended, but certainly an option.

Legal approach

Wave her over

Strap on your balls and ask her out

move to her tables