01:59 GMT21 April 2021
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    In early July, US tennis star Serena Williams slammed the country's anti-doping watchdog for an out-of-competition test, which it tried to conduct when the athlete wasn't at home.

    In one of her latest tweets on Wednesday, seven-time Wimbledon champion Serena Williams pointed the finger at the US Anti-Doping Agency (USADA) over what she described as "discrimination."

    Singling out random drug tests, the 36-year-old specifically bemoaned the fact that "out of all the players it's been proven I'm the one getting tested the most."

    In a separate tweet, she also pledged to do her best "to have a clean sport."

    The tweets came about three weeks after Williams complained about the way the USADA had treated her. According to the tennis star, an anti-doping official arrived at her residence early in the morning on June 14, some 12 hours before the time she previously agreed on.

    READ MORE: Serena Williams Beat All Other Guests at Beer-Pong at Royal Wedding

    Earlier, USADA had confirmed that Williams had passed all of the five tests she underwent in June.

    READ MORE: Sharapova Responds to Serena Williams, Who Gave Up Match With Her Due to Injury

    In May, Williams also expressed frustration over the constant invasive behavior of the US anti-doping watchdog which she tweeted was "here again second time this week."


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