Novak Djokovic warned to expect toughest Matteo Berrettini test yet at US Open | Tennis | Sport

He then triumphed over Oscar Otte of Germany 6-4 3-6 6-3 6-2 to book a place in the quarter-finals against Djokovic.The Serb has not been his all-conquering self thus far at the US Open but has still defeated Holger Rune, Tallon Griekspoor, Kei Nishikori and Jenson Brooksby en route to the last eight.In winning those matches, Djokovic has dropped just three sets.Former world number 25 Mischa Zverev – who defeated Andy Murray in four sets at the Australian Open in 2017 – insisted the reason Djokovic is not playing at his best is because of the immense amount of pressure he is under.



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