Tennis player Lulu Sun is underway at the US Open

Taking on Italian Lucia Bronzetti in the first round - the New Zealander trails 4-3 on serve on court 12 at Flushing Meadows.

Meanwhile - a couple of notable day one casualties.

Ninth seed Maria Sakkari's retired injured, while men's 15th seed Holger Rune's suffered a straight sets defeat to unseeded American Brandon Nakashima.

Among those safely through are Coco Gauff , Madison Keys, Paula Badosa and Olympic champion Qinwen Zheng .

Alexander Zverev , Ben Shelton, Taylor Fritz, Andrey Rublev and Casper Ruud are through in the men's draw.