No. 1 Novak Djokovic (Serbia) vs No. 9 Marin Cilic (Croatia)
Head-to-Head: 2011 US Open Champion Djokovic leads 13-0. 2014 US Open Champion Cilic has won five sets in all. He came closest to beating Djokovic in the quarterfinals of 2014 Wimbledon when he led two sets to one but lost in five sets. They have met at the US Open once, back in 2008 when Djokovic won a very close 4-set match in the third round.
Cilic is currently on a 12-match winning streak at the US Open.
Who wins this match?