World number one Serena Williams cruised through to the third round with victory over Vania King ©Getty Images

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Serena Williams' victory over her compatriot saw her equal the record of 306 Grand Slam wins ©Getty Images
Serena Williams' victory over her compatriot saw her equal the record of 306 Grand Slam wins ©Getty Images
A number of famous faces were in attendance at the Arthur Ashe Stadium to see Serena Williams in action ©Getty Images
A number of famous faces were in attendance at the Arthur Ashe Stadium to see Serena Williams in action ©Getty Images
Venus Williams also reached round three as she beat Julia Görges of Germany ©Getty Images
Venus Williams also reached round three as she beat Julia Görges of Germany ©Getty Images
Britain's Andy Murray overcame tricky opponent Marcel Granollers of Spain in straight sets ©Getty Images
Britain's Andy Murray overcame tricky opponent Marcel Granollers of Spain in straight sets ©Getty Images
Andy Murray's match was one of a number of contests to take place under the roof due to a storm in New York ©Getty Images
Andy Murray's match was one of a number of contests to take place under the roof due to a storm in New York ©Getty Images
Stanislas Wawrinka of Switzerland comfortably reached round three as he clinched a dominant win against Alessandro Giannessi of Italy ©Getty Images
Stanislas Wawrinka of Switzerland comfortably reached round three as he clinched a dominant win against Alessandro Giannessi of Italy ©Getty Images
Japan's Kei Nishikori needed four sets to get past Karen Khachanov of Russia ©Getty Images
Japan's Kei Nishikori needed four sets to get past Karen Khachanov of Russia ©Getty Images
Simona Halep of Romania overcame Lucie Safarova of the Czech Republic to book her spot in the third round ©Getty Images
Simona Halep of Romania overcame Lucie Safarova of the Czech Republic to book her spot in the third round ©Getty Images
Olympic silver medallist Juan Martin del Potro progressed to round three at the US Open for the first time since 2012 by beating American Steve Johnson ©Getty Images
Olympic silver medallist Juan Martin del Potro progressed to round three at the US Open for the first time since 2012 by beating American Steve Johnson ©Getty Images