NEW YORK, NEW YORK - SEPTEMBER 07: Elena Rybakina of Kazakhstan returns a shot against Naomi Osaka of Japan during their Women'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 Sarah Stier/Getty Images)

NEW YORK, NEW YORK - SEPTEMBER 07: Elena Rybakina of Kazakhstan serves against Naomi Osaka of Japan during their Women'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 Sarah Stier/Getty Images)

Argentina's Francisco Cerundolo (R) and Belgium's Alexander Blockx (L) shake hands after Blockx's victory in their men's singles round of 16 match on day nine of the US Open tennis tournament at the USTA Billie Jean King National Tennis Center in New York City on September 7, 2026. (Photo by KENA BETANCUR / AFP via Getty Images)

Belgium's Alexander Blockx celebrates defeating Argentina's Francisco Cerundolo in 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)

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

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

Belgium's Alexander Blockx celebrates defeating Argentina's Francisco Cerundolo in 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 celebrates defeating Argentina's Francisco Cerundolo in 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)