Novak Djokovic booked his place in the quarter-finals by beating Britain's Kyle Edmund ©Getty Images

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The world number one and defending champion had played just six games in the previous two rounds after his opponents withdrew through injury ©Getty Images
The world number one and defending champion had played just six games in the previous two rounds after his opponents withdrew through injury ©Getty Images
The defeat spelled the end of Briton Kyle Edmund's fairytale run at the US Open ©Getty Images
The defeat spelled the end of Briton Kyle Edmund's fairytale run at the US Open ©Getty Images
Fourth seed Rafael Nadal of Spain crashed out as he was beaten in five sets by Frenchman Lucas Pouille ©Getty Images
Fourth seed Rafael Nadal of Spain crashed out as he was beaten in five sets by Frenchman Lucas Pouille ©Getty Images
Pouille will go up against compatriot Gael Monfils in the quarter-finals ©Getty Images
Pouille will go up against compatriot Gael Monfils in the quarter-finals ©Getty Images
The contest between Nadal and Pouille was one of the highlights of the tournament so far ©Getty Images
The contest between Nadal and Pouille was one of the highlights of the tournament so far ©Getty Images
Latvia's Anastasija Sevastova saw off the challenge of Britain's Johanna Konta ©Getty Images
Latvia's Anastasija Sevastova saw off the challenge of Britain's Johanna Konta ©Getty Images
Caroline Wozniacki of Denmark ended the US Open challenge of home favourite Madison Keys ©Getty Images
Caroline Wozniacki of Denmark ended the US Open challenge of home favourite Madison Keys ©Getty Images
Angelique Kerber of Germany proved too strong for the Czech Republic's Petra Kvitová ©Getty Images
Angelique Kerber of Germany proved too strong for the Czech Republic's Petra Kvitová ©Getty Images
Last year's runner-up Roberta Vinci is also through as she beat Lesia Tsurenko of Ukraine ©Getty Images
Last year's runner-up Roberta Vinci is also through as she beat Lesia Tsurenko of Ukraine ©Getty Images