Nick's serve wasn't so fast today but yeah, Raonic showed great maturity and handled himself impeccably. A lot depends on how he handles the pressure of the occasion: will he be satisfied with his lot, or does he have it in him to shove Federer out of the way?
I think the four semi-finalists see this one as a huge chance, especially Federer, for whom it might realistically be his last chance to win a major. He's not gonna let it slip against Milos. Federer's serve is quite handy still, and I expect him to have too much game for the youngster....