Let's take a look at Roger before he joins the loser train:

Poor guy doesn't know he's one day away from losing to Tsonga. Again.

Okay, good. He looks serious again.

And he's even sweating. A lot. Which means that he must be working hard.

Looking good. But...

...now he's smiling again.
Hey Paul, perhaps your pupil needs to do a little less smiling and a little more winning. Just saying.