Popsugar Fitness Sports History Made: Three Moms Advance to US Open Quarterfinals For the First Time, 3 Moms, Including Serena Williams, Are in the US Open Quarterfinals September 9, 2020 by Samantha Brodsky First Published: September 8, 2020 View On One Page Photo 5 of 8 ADVERTISEMENT () Start Slideshow View this post on Instagram A post shared by Tsvetana Pironkova (@tpironkova) on May 5, 2019 at 1:17am PDT Share This Link Copy ← Use Arrow Keys → 5 Tsvetana Pironkova and Her Son Alexander Previous Next Start Slideshow Serena WilliamsAthletesSportsTennisUS Open