You're a history maker and a trailblazer, tweets Billie Jean
After Serena Williams' 23 Grand Slam title, 12-time Grand Slam champion Billie Jean King tweeted, "Congrats @serenawilliams on your 23rd major title and return to top of @WTA rankings. You're a history maker and a trailblazer." "I never know who to root for when they play one another. @Venuseswilliams is all elegance. But 23! @serenawilliams is GOAT.#AusOpen", tweeted a user.