NEW YORK, NEW YORK - SEPTEMBER 07: Alexander Blockx of Belgium celebrates after defeating 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)

Belgium's Alexander Blockx hits a return to Argentina's Francisco Cerundolo during their men's singles round of 16 tennis match on day nine of the US Open tennis tournament at the USTA Billie Jean King National Tennis Center in New York on September 7, 2026. (Photo by kena betancur / AFP via Getty Images)

Belgium's Alexander Blockx hits a return to Argentina's Francisco Cerundolo during their men's singles round of 16 tennis match on day nine of the US Open tennis tournament at the USTA Billie Jean King National Tennis Center in New York on September 7, 2026. (Photo by kena betancur / AFP via Getty Images)

NEW YORK, NEW YORK - SEPTEMBER 07: Neal Skupski of Great Britain (R) and Christian Harrison (L) of United States celebrate a point against Jan Choinski of Great Britain and Alexander Donski of Bulgaria during their Men's Doubles Second 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 Matthew Stockman/Getty Images)

NEW YORK, NEW YORK - SEPTEMBER 07: Neal Skupski of Great Britain (R) and Christian Harrison (L) of United States celebrate a point against Jan Choinski of Great Britain and Alexander Donski of Bulgaria during their Men's Doubles Second 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 Matthew Stockman/Getty Images)

Belgium's Alexander Blockx hits a return to Argentina's Francisco Cerundolo during their men's singles round of 16 tennis match on day nine of the US Open tennis tournament at the USTA Billie Jean King National Tennis Center in New York on September 7, 2026. (Photo by kena betancur / AFP via Getty Images)

NEW YORK, NEW YORK - SEPTEMBER 07: Francisco Cerundolo of Argentina hugs after a loss against Alexander Blockx of Belgium 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)

NEW YORK, NEW YORK - SEPTEMBER 07: Alexander Blockx of Belgium celebrates after defeating 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)