A winning start for the defending champ 🎾 Carlos Alcaraz progressed to the second round of the US Open, the final grand slam of the calendar year, after his opponent, Germany’s Dominik Koepfer, retired injured in the second set. The Spaniard next faces South African Lloyd Harris in the second round (📸 Corey Sipkin/AFP/Getty Images). . . . #carlosalcaraz #usopen #usopen2023 #tennis #instatennis #tennisgram