NEW YORK, NEW YORK - SEPTEMBER 07: Alexander Blockx of Belgium reacts after winning the first set against Francisco Cerundolo of Argentina during their Men's Singles Fourth Round match on Day Nine of the 2026 US Open at USTA Billie Jean King National Tennis Center on September 07, 2026 in the Flushing neighborhood of the Queens borough of New York City. (Photo by Al Bello/Getty Images)