By Joe Sutton

PHILADELPHIA (CNN) — Serena Williams has given birth to a baby girl, according to her coach and the US Open’s official Twitter account.

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Her sister Venus Williams also confirmed the birth during an interview before her match at the US Open on Friday when asked about Serena having a baby girl and her feelings on becoming an aunt. She said, “Obviously I’m super excited, words can’t describe.”

The US Open congratulated Williams on its Twitter page, “@serenawilliams won a new title on Day 5 at the #USOpen: Mom.”

Serena’s coach Patrick Mouratoglou announced on his verified Twitter account, “Congratulations @SerenaWilliams for your baby girl. I am so happy for you and I feel your emotion. Recover well & enjoy without limitation.”

He also wished her a speedy recovery. “We have a lot of work ahead of us.”

Serena or fiance Alexis Ohanian, co-founder of Reddit, have not issued an official statement on social media.

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