Alexander Zverev upset the third seed Daniil Medvedev 6-4, 5-7, 6-4 in a clash between former champions to enter the quarter-finals of the ATP Cincinnati Open, breaking the Russian three times and saving six of eight breakpoints. The German 16th seed came into the match with a 6-9 record against Medvedev and having lost all three of their meetings this year. He will next face France's Adrian Mannarino.