"You'll be fine. You want to play a round against me, see how it goes?"

He's really more interested in seeing if she does have a good poker face, and if she has any obvious tells. He has the feeling that if she turns out to be decent at the game, he'll be able to make a lot more money. People will pay to play with someone who looks like her, and if she can take their money while being charming about it, all the better.