Daniil Medvedev is out of the US Open after a dramatic first round loss to Benjamin Bonzi.
The former champion lost out in five sets in a match marred by an incident when a photographer stepped onto the court.
Medvedev subsequently challenged the referee before play continued.
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Elsewhere in the men's draw, Novak Djokovic came through his encounter with Learner Tien in straight sets.
In the women's draw, Petra Kvitov�, Elena Rybakina and Madison Keys all take to the court for their first round matches later.
Emma Radacanu and defending champion Ayrna Sabalenka both came through their games yesterday unscathed.
