Serena Williams gave birth to her first child on Friday and her sister Venus was among the first to congratulate her

Venus Williams expressed her delight at becoming an aunt following the birth of her sister Serena's first child.

"Obviously I'm super excited," Venus told ESPN's Pam Shriver after her third round win over Maria sakkari at the us open. "Words can't describe."

Former WTA World No.1 Serena Williams is engaged to Reddit co-founder Alexis Ohanian and gave birth to her first child in West Palm Beach, Florida, on Friday.