Is this tennis player's Serena Williams impersonation racist?

Tennis star accused of racism

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Tennis star Serena Williams says Caroline Wozniacki's impersonation of her in Brazil was not racist

Venus Williams - Wikipedia

Despite decades of racist and sexist attacks, Serena Williams keeps winning - Vox

Is this tennis player's Serena Williams impersonation racist?

Dominant Serena Williams reaches French Open fourth round as path to title opens up

Novak Djokovic & Andy Roddick do all the time, now it's racist?- When Serena Williams defended Caroline Wozniacki after controversial impersonation

Serena Williams and Roger Federer retiring leaves a hole in tennis : NPR