[ad_1] Novak Djokovic, of Serbia, gestures to the crowd after he lost to Mariano Navone, of Argentina, during the first round of the U.S. Open tennis championships Sunday, Aug. 30, 2026, in New York. (AP Photo/Frank Franklin II) Novak Djokovic’s first-round defeat at the 2026 US Open may have ended his campaign earlier than expected,…