Serena Williams, expectant mother and winner of 23 Grand Slams, has returned to her world No. 1 ranking. Still on vacation in Mexico, the 35-year-old shared a special message to her future child.

"I can't wait for you to join the players box next year," Williams writes. "But most importantly, I am so happy to share being number one in the world with you.... once again today."

While No. 1 may be most important to her, the hint at her return (as soon as next year) is what will resonate most strongly with her fans and the WTA tour.

Williams also mentions her fiancé Alexis Ohanian, who proposed to her in Rome last December.

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The Reddit co-founder is celebrating his 34th birthday. The couple will welcome their first child in the fall, and Williams will not play again in 2017. Will the world really see Williams' first child in her player box one day? Everyone can only cross their fingers and hope for the best.