The effort will kick off Aug 24 with an exhibition event at Louis Armstrong Stadium in New York, with 22-times Grand Slam winner Rafa Nadal, world number one Iga Swiatek and John McEnroe among the headliners.

Ticket sales will go toward assisting impacted communities in Ukraine.

“This is a vitally important cause, and I’m proud of the way in which our sport has rallied together to lend a much-needed hand to our friends in Ukraine,” USTA chairman and president Mike McNulty said in a statement.

Russia invaded Ukraine on Feb 24, calling it a “special military operation” aimed at preemptively safeguarding its security against Nato expansion. Ukraine and the West accuse Moscow of waging an unprovoked imperial-style war of aggression.

Belarus, a close Russian ally, was a key staging ground as Russia launched the invasion.

Wimbledon banned Russian and Belarusian players from competing this year, following in the steps of sporting bodies around the globe.

The US Open, in contrast, will allow competitors from the two countries to play under a neutral flag, a move that Ukrainian Olympic bronze medallist Elina Svitolina criticised.

“I don’t support it because I feel like they should have taken more serious action,” she told Reuters in June.

The US Open main draw begins Aug 29.