The #USOpen day session on Arthur Ashe Stadium belongs to @sloanestephens, who served exit papers to A. Sevastova, 6-3, 3-6, 7(7)-6(4). Wave that 🇺🇸if you're proud of this #AmericanMade winner. (📸 by @skinnywashere) #ustennis #sloanestephens #tennis #nevergiveup #grandslam #winner #todayisyourday #newyorkcity #teamusa