Serena and Kenin roll on, Muguruza sent packing in New York

Serena Williams showed signs of improvement en route to the US Open third round as Australian Open champion Sofia Kenin took down Leylah Fernandez.

Former world number one and third seed Williams prevailed in a tricky test against Margarita Gasparyan in straight sets in New York on Thursday.

Countrywoman and second seed Kenin contained Canadian teenager Fernandez behind closed doors at Flushing Meadows.

It was not good news for 10th seed Muguruza, who was sent packing by unranked Bulgarian Tsvetana Pironkova.

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