World number ten Frances Tiafoe is through to the third round at the US Open.
He was a winner in straight sets over Sebastien Ofner.
Andy Murray is among those in action later - he faces Grigor Dimitrov.
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In the women's draw, Caroline Wozniacki secured an impressive win in straight sets over Petra Kvitova.
This evening, fifth seed Ons Jabeur goes up against Linda Noskova.
