Novak Djokovic lost his opening match at the 2026 US Open on August 26, falling 2-6, 6-4, 6-4 to Thiago Agustin Tirante after struggling with high heat and humidity conditions in New York [1, 2, 3]. The 39-year-old Serbian star, chasing a record-breaking 25th Grand Slam title to surpass Margaret Court's 24 major singles crowns, was visibly affected during an 18-minute service game in the second set when he dropped to his knees [1, 2, 3].

Djokovic acknowledged ongoing health problems triggered by hot and humid conditions that have troubled him for years. "It's simply a health issue I have. I have a lot of problems, especially when there’s high humidity and heat," he said after the match [1, 3]. These physical challenges heighten questions about his ability to withstand the punishing conditions of the US Open, which features late-summer heat, heavy humidity, hard courts, and requires seven grueling rounds to win the title [1, 2, 3].

Known for his mental toughness, Djokovic holds the men's record with 10 US Open finals appearances and recently reached the semifinals at Wimbledon and the final at the Australian Open earlier this year before the US Open started [1, 2, 3]. However, his early exit in Cincinnati in August highlighted physical limits entering the tournament [1, 2, 3].

Djokovic’s age and the demands of best-of-five set matches leave little margin for error. His experience and pressure handling remain his biggest assets, but energy conservation through short matches and efficient service games is now crucial for any chance at history [1, 2, 3].

The field also changed shape as top challenger Jannik Sinner withdrew with a right-knee injury, removing one of Djokovic’s toughest opponents [1, 2, 3]. Defending champion Carlos Alcaraz is considered the leading contender despite a recent wrist injury and time off. Alcaraz beat Djokovic in the 2025 US Open semifinals and the 2026 Australian Open final [1, 2, 3]. Other notable threats include French Open champion Alexander Zverev and American players Ben Shelton and Taylor Fritz [1, 2, 3].

Djokovic will need to adapt quickly to the conditions if he hopes to continue his quest to surpass Court’s record. His next matches will test his endurance as the tournament progresses.