We celebrate all the amazing parents on tour. Happy Mother's Day! Cc @clijsterskim @vichka35 & mom-to-be @serenawilliams __ Did you know? Only two women have won the #USOpen title as a mom: #KimClijsters & Margaret Court. __ #mom #wta #momlife #SerenaWilliams #VictoriaAzarenka #mothersday #inspiringwoman #mommyandme