Novak Djokovic (SRB)  vs
Richard Gasquet (FRA)  vs Rafael Nadal (ESP) . Richard Gasquet surprised most people (including himself, I bet) by beating David Ferrer in the quarterfinal to reach the second major semifinal of his career. He has never beaten Nadal in 10 meetings (4 of those on hard courts) and is probably reasonably pleased with what he has achieved so far in the tournament. Plus, Nadal is undefeated on hard courts in 2013, having won 20 consecutive matches (and 3 ATP hard court Masters Series tournaments: Indian Wells, Montreal and Cincinnati). After his ignominous exit and extended absence from the game for more than half of 2012 the Spaniard has returned with a vigor and energy that is demolishing his opponents. He has a better than even chance of winning his 2nd US Open title as well. Mad Professah's pick: Nadal.