Alexander Zverev needed nearly four hours to defeat Grigor Dimitrov 6-7 (2) 7-6 (8) 6-1 6-1 to reach the Round of 16 at the US Open for the fourth time.

Between them, Alexander Zverev and Stefanos Tsitsipas have reached five major singles finals and won 36 ATP singles titles. But in recent years, each has also shown signs of physical and emotional ...