however Nole shows very little or no emotions during a match nowadays. He is very composed.
I don't know if that's totally true. He might have more of a poker face now than he did years ago, and he's more composed than someone like Andy Murray, but he's still somewhat emotional during the match. Just thinking over the last couple of months- he was animated in the Shanghai final (smashed his racquet, screaming after he won the TB) as well as against Fed in the WTF final.
But maybe part of the reason why these guys don't go really crazy on court (except for Novak after he wins...
) is because they don't see the need to panic if they lose a point or a set.