US Open 2014: Federer Vs. Cilic, Djokovic Vs. Nishikori; Start Time, Tickets, Prediction For Semifinals

The U.S. Open enters the final four on Saturday with top seeds Novak Djokovic and Roger Federer looking to see off younger rivals in the form of their life and set up their second straight Grand Slam final. After falling to a painful defeat at Wimbledon, Federer, aged 33, is again chasing Grand Slam No. 18, but must negotiate a meeting with Croatian Marin Cilic before getting a rematch with Djokovic, if the world No. 1 can get past marathon-man Kei Nishikori.