Now there are two US Open babies of pro tour superstars. (Getty)

Just one day after Serena Williams gave birth to her first child, a baby girl, Novak Djokovic and his wife Jelena have reportedly welcomed their own girl. The couple have named her Tara.

Djokovic missed the US Open this year with an elbow injury, but it's all worked out as he got to be there for the birth of his second child. The Djokovics had a son named Stefan in 2014.

Now Tara Djokovic and Serena's daughter will both be celebrating birthdays during the US Open.