A US Open competitor has been accused of poor sportsmanship towards her opponent after she progressed to the fourth round on Saturday.

Russian-born Anastasia Potapova stunned Flushing Meadows when she knocked out American Amanda Anisimova in straight sets.

After shaking hands at the net and celebrating her victory with the crowd, Potapova was caught on camera appearing to sarcastically wave goodbye in the direction of Anisimova.

Seconds later, Anisimova walked past Potapova and off the court and fans took to social media to call her out for her unwanted gesture. 

One commented: ‘Tell me that Potapova didn’t just do what I think I saw her do, that would be a total lack of respect.’

Another added: ‘I’ve rewatched it a few times and can’t imagine it being anything other than Potapova rudely waving and saying ‘bye bye’ to Anisimova.’

Russian-born Anastasia Potapova has been accused of waving sarcastically at her beaten rival

Amanda Anisimova missed repeated chances by converting just three of 16 break-points

Meanwhile, a third added: ‘Is this behavior typical of Potapova? I understand the moment getting to you but don’t think there’s much excuse for this.’

It came at the end of a frustrating day for Anisimova, who missed repeated chances by converting just three of 16 break-point chances before losing 6-2, 7-5.

Potapova, a 25-year-old who was born in Russia but now represents Austria, went six for eight and matched her best showing in a Grand Slam tournament by reaching the fourth round.

Anisimova made the final at both Wimbledon and the US Open in 2025, falling to Aryna Sabalenka in Flushing Meadows.

But after reaching the quarterfinals of the Australian Open, the American was eliminated in the third round of the last three majors this year.

Potapova will play No. 5 seed Mirra Andreeva, the French Open champion.