They were fined and threatened by the ATP who run the tour. They and the LTA were the only ones who tried to ban Russians and Belarusians

doubt it.

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Wimbledon is the Olympics of Tennis. the Olympics let you compete as an Independent.. (for basically any reason)

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2022 Winter Olympics
Further information: Russian Olympic Committee athletes at the 2022 Winter Olympics
Following a decision by the World Anti-Doping Agency (WADA), it was announced that Russia would compete under the acronym "ROC", after the name of the Russian Olympic Committee. On aftermatch, the IOC announced that the Russian national flag would be substituted by the flag of the Russian Olympic Committee. It would also be allowed to use team uniforms featuring the Russian national colours, the logo of the Russian Olympic Committee and bearing the acronym "ROC".[27]

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https://en.wikipedia.org/wiki/Independent_Olympians_at_the_Olympic_Games

Athletes have competed as independent Olympians at the Olympic Games for various reasons, including political transition, international sanctions, suspensions of National Olympic Committees, and compassion. Independent athletes have come from North Macedonia, East Timor, South Sudan and Curaçao following geopolitical changes in the years before the Olympics, from the Federal Republic of Yugoslavia (present-day Montenegro and Serbia) as a result of international sanctions, from India and Kuwait due to the suspensions of their National Olympic Committees, and from Russia for mass violations of anti-doping rules.