With tennis being the standard-bearer for gender equality and women’s sports, the stars of both the WTA and ATP tours celebrated International Women’s Day.

Billie Jean King, the founder of the WTA and a leading voice for women’s rights, was in Singapore, celebrating with a well-chosen T-shirt.

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Serena Williams would return to the court for the first time as a mother, winning her opening Indian Wells round in straight sets over Zarina Diyas.

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Maria Sharapova, who lost in her opener, announced a program with the National Association of Business Owners and Sugarpova to encourage more women to get into entrepreneurship.

Victoria Azarenka, who was unable to play since Wimbledon due to a custody battle, celebrated International Women’s Day before returning to the court on Thursday night with a win over Heather Watson.

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Petra Kvitova took a direct route, supporting the cause to shrink the wage gap for women worldwide.

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It wasn’t just women celebrating as Novak Djokovic recognized the special women in his life.