NEW YORK NEW YORK - AUGUST 30: Katie Boulter of Great Britain returns a shot against Carol Young Suh Lee of the United States during their Women's Singles First Round match on Day One of the 2026 US Open at USTA Billie Jean King National Tennis Center on August 30, 2026 in the Flushing neighborhood of the Queens borough of New York City. (Photo by Julian Finney/Getty Images)

NEW YORK NEW YORK - AUGUST 30: Stefan Djokovic, son of Novak Djokovic, looks on at his father's match against Mariano Navone of Argentina during their Men's Singles First Round match on Day One of the 2026 US Open at USTA Billie Jean King National Tennis Center on August 30, 2026 in the Flushing neighborhood of the Queens borough of New York City. (Photo by Julian Finney/Getty Images)

NEW YORK NEW YORK - AUGUST 30: Jelena Djokovic, wife of Novak Djokovic, looks on at his match against Mariano Navone of Argentina during their Men's Singles First Round match on Day One of the 2026 US Open at USTA Billie Jean King National Tennis Center on August 30, 2026 in the Flushing neighborhood of the Queens borough of New York City. (Photo by Julian Finney/Getty Images)

NEW YORK NEW YORK - AUGUST 30: Ball kids use towels to dry raindrops on the court surface during the Men's Singles First Round match between Novak Djokovic of Serbia and Mariano Navone of Argentina on Day One of the 2026 US Open at USTA Billie Jean King National Tennis Center on August 30, 2026 in the Flushing neighborhood of the Queens borough of New York City. (Photo by Julian Finney/Getty Images)

NEW YORK NEW YORK - AUGUST 30: Ball kids use towels to dry raindrops on the court surface during the Men's Singles First Round match between Novak Djokovic of Serbia and Mariano Navone of Argentina on Day One of the 2026 US Open at USTA Billie Jean King National Tennis Center on August 30, 2026 in the Flushing neighborhood of the Queens borough of New York City. (Photo by Julian Finney/Getty Images)

NEW YORK, NEW YORK - AUGUST 30: Kimberly Schlapman, Philip Sweet, Karen Fairchild and Jimi Westbrook of Little Big Town at the Heineken Suite of the US Open at the USTA National Tennis Center in New York on August 30, 2026 in New York City. (Photo by Craig Barritt/Getty Images for Heineken)

NEW YORK NEW YORK - AUGUST 30: Mariano Navone of Argentina serves against Novak Djokovic of Serbia during their Men's Singles First Round match on Day One of the 2026 US Open at USTA Billie Jean King National Tennis Center on August 30, 2026 in the Flushing neighborhood of the Queens borough of New York City. (Photo by Julian Finney/Getty Images)

NEW YORK NEW YORK - AUGUST 30: Novak Djokovic of Serbia returns a shot in his match against Mariano Navone of Argentina during their Men's Singles First Round match on Day One of the 2026 US Open at USTA Billie Jean King National Tennis Center on August 30, 2026 in the Flushing neighborhood of the Queens borough of New York City. (Photo by Julian Finney/Getty Images)