Defending champion Daniil Medvedev started with a bang as he ousted American Stefan Kozlov in the first round ©Getty Images

Picture gallery

Two-time Grand Slam champion Simona Halep of Romania suffered a shock first round exit at the US Open ©Getty Images
Two-time Grand Slam champion Simona Halep of Romania suffered a shock first round exit at the US Open ©Getty Images
Ukraine's Daria Snigur was making her Grand Slam main draw debut as she beat Simona Halep ©Getty Images
Ukraine's Daria Snigur was making her Grand Slam main draw debut as she beat Simona Halep ©Getty Images
Bianca Andreescu of Canada prevailed in three sets against Harmony Tan of France ©Getty Images
Bianca Andreescu of Canada prevailed in three sets against Harmony Tan of France ©Getty Images
Haddad Maia of Brazil posted a dominating 6-0, 6-0 win over Croatia’s Ana Konjuh ©Getty Images
Haddad Maia of Brazil posted a dominating 6-0, 6-0 win over Croatia’s Ana Konjuh ©Getty Images

Greek third seed Maria Sakkari got the better of Germany’s Tatjana Maria in three sets ©Getty Images
Greek third seed Maria Sakkari got the better of Germany’s Tatjana Maria in three sets ©Getty Images
Britain’s Andy Murray started with a win on the 10th anniversary of his US Open victory ©Getty Images
Britain’s Andy Murray started with a win on the 10th anniversary of his US Open victory ©Getty Images
Matteo Berretini triumphed in straight sets as he beat Chile’s Nicolas Jarry 6-2, 6-3, 6-3 ©Getty Images
Matteo Berretini triumphed in straight sets as he beat Chile’s Nicolas Jarry 6-2, 6-3, 6-3 ©Getty Images
Wu Yibing created history as he became the first Chinese man to win a a Grand Slam singles match in 63 years ©Getty Images
Wu Yibing created history as he became the first Chinese man to win a a Grand Slam singles match in 63 years ©Getty Images
Tim van Rijthoven of the Netherlands won a five-setter against China’s Zhang Zhizhen ©Getty Images
Tim van Rijthoven of the Netherlands won a five-setter against China’s Zhang Zhizhen ©Getty Images