Canada's Denis Shapovalov waves to fans as he retires the men's singles quarter-final tennis match against Spain's Carlos Alcaraz due to an injury at the ATP Tour Japan Open Tennis Championships at the Ariake Tennis Forest Park in Tokyo on October 4, 2026. (Photo by Rie KIKUCHI / AFP via Getty Images)

Canada's Denis Shapovalov waves to fans as he retires the men's singles quarter-final tennis match against Spain's Carlos Alcaraz due to an injury at the ATP Tour Japan Open Tennis Championships at the Ariake Tennis Forest Park in Tokyo on October 4, 2026. (Photo by Rie KIKUCHI / AFP via Getty Images)

Canada's Denis Shapovalov reacts as he plays against Spain's Carlos Alcaraz during their men's singles quarter-final tennis match at the ATP Tour Japan Open Tennis Championships at the Ariake Tennis Forest Park in Tokyo on October 4, 2026. (Photo by Rie KIKUCHI / AFP via Getty Images)

Canada's Denis Shapovalov hits a return against Spain's Carlos Alcaraz during their men's singles quarter-final tennis match at the ATP Tour Japan Open Tennis Championships at the Ariake Tennis Forest Park in Tokyo on October 4, 2026. (Photo by Rie KIKUCHI / AFP via Getty Images)

Spain's Carlos Alcaraz reacts as he plays against Canada's Denis Shapovalov during their men's singles quarter-final tennis match at the ATP Tour Japan Open Tennis Championships at the Ariake Tennis Forest Park in Tokyo on October 4, 2026. (Photo by Rie KIKUCHI / AFP via Getty Images)

Canada's Denis Shapovalov hits a return against Spain's Carlos Alcaraz during their men's singles quarter-final tennis match at the ATP Tour Japan Open Tennis Championships at the Ariake Tennis Forest Park in Tokyo on October 4, 2026. (Photo by Rie KIKUCHI / AFP via Getty Images)

Spain's Carlos Alcaraz reacts as he plays against Canada's Denis Shapovalov during their men's singles quarter-final tennis match at the ATP Tour Japan Open Tennis Championships at the Ariake Tennis Forest Park in Tokyo on October 4, 2026. (Photo by Rie KIKUCHI / AFP via Getty Images)

Spain's Carlos Alcaraz hits a return against Canada's Denis Shapovalov during their men's singles quarter-final tennis match at the ATP Tour Japan Open Tennis Championships at the Ariake Tennis Forest Park in Tokyo on October 4, 2026. (Photo by Rie KIKUCHI / AFP via Getty Images)