No. 2-seed Andy Murray will face No. 6-seed Kei Nishikori in the U.S. Open quarterfinals on Tuesday. Murray leads their head to head 7-1 and has won their last four meetings.
This is an interesting matchup because both players have similar strengths, but Murray holds a five-inch height advantage, with just a bit more reach and power. Both have served well in reaching the quarterfinals—90% service games won—but Murray has the edge on aces (36 to 25) and power (141 to 123 mph fastest serves). Both players have won a very high percentage of second serve points (59% Nishikori, 58% Murray), so it's not just their first serves that make them tough to break.