Anastasija Sevastova stunned Spanish third seed Garbine Muguruza to reach the third round at the US Open ©Getty Images

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French Open champion Garbine Muguruza has now lost in the second round at the US Open for two years in a row ©Getty Images
French Open champion Garbine Muguruza has now lost in the second round at the US Open for two years in a row ©Getty Images
American qualifier Ryan Anderson surprised Canada's Milos Raonic ©Getty Images
American qualifier Ryan Anderson surprised Canada's Milos Raonic ©Getty Images
The Wimbledon runner-up was struggling physically throughout before succumbing to a four-set defeat ©Getty Images
The Wimbledon runner-up was struggling physically throughout before succumbing to a four-set defeat ©Getty Images
Spaniard Rafael Nadal cruised through to the third round with victory over Andreas Seppi ©Getty Images
Spaniard Rafael Nadal cruised through to the third round with victory over Andreas Seppi ©Getty Images
The match took place under the roof at the Arthur Ashe Stadium ©Getty Images
The match took place under the roof at the Arthur Ashe Stadium ©Getty Images
Caroline Wozniacki of Denmark sprung a shock as she beat Svetlana Kuznetsova ©Getty Images
Caroline Wozniacki of Denmark sprung a shock as she beat Svetlana Kuznetsova ©Getty Images
2014 winner Marin Cilic breezed into round three as he dropped just six games ©Getty Images
2014 winner Marin Cilic breezed into round three as he dropped just six games ©Getty Images
Roberta Vinci of Italy is aiming to go one better at Flushing Meadows this year after finishing as runner-up in 2015 ©Getty Images
Roberta Vinci of Italy is aiming to go one better at Flushing Meadows this year after finishing as runner-up in 2015 ©Getty Images
Britain's Johanna Konta collapsed on court during her second round match against Tsvetana Pironkova due to the heat ©Getty Images
Britain's Johanna Konta collapsed on court during her second round match against Tsvetana Pironkova due to the heat ©Getty Images