Popsugar Health & Fitness Athletes History Made: Three Mums Advance to US Open Quarterfinals History Is Being Made at the US Open — 3 Mums Are Advancing to the Quarterfinals 9 September 2020 by Samantha Brodsky First Published: 8 September 2020 View On One Page Photo 3 of 8 ADVERTISEMENT () Start Slideshow Share This Link Copy ← Use Arrow Keys → 3 More of Olympia Watching Serena Williams at the US Open We can't get over her cute little mask! Previous Next Start Slideshow AthletesSportsUS OpenTennisSerena Williams