@USTA's @captain_kathy and @martinblackman_usta are super excited that there are 4 American women in the #USOpen semifinals - they're sending @cocovandey, @venuswilliams, @sloanestephens & @madisonkeys a special message! 🔴⚪️🔵 #ustennis #madisonkeys #sloanestephens #cocovandeweghe #venuswilliams #tennis #🇺🇸 #🎾 #MartinBlackman #KathyRinaldi #americanmade