Czech Republic's Karolina Muchova serves to Japan's Naomi Osaka during their women's singles match at the China Open tennis tournament in Beijing on October 6, 2026. (Photo by ADEK BERRY / AFP via Getty Images)

Japan's former tennis player Kei Nishikori waves to fans during his tribute ceremony at the Ariake Tennis Forest Park during the Japan Open tennis tournament in Tokyo on October 6, 2026. (Photo by Rie KIKUCHI / AFP via Getty Images)

US former tennis player Michael Chang gives a speech for Japan's former tennis player Kei Nishikori during his tribute ceremony at the Ariake Tennis Forest Park during the Japan Open tennis tournament in Tokyo on October 6, 2026. (Photo by Rie KIKUCHI / AFP via Getty Images)

Japan's former tennis player Kei Nishikori closes his eyes during his tribute ceremony at the Ariake Tennis Forest Park during the Japan Open tennis tournament in Tokyo on October 6, 2026. (Photo by Rie KIKUCHI / AFP via Getty Images)

Japan's former tennis player Kei Nishikori waves to fans during his tribute ceremony at the Ariake Tennis Forest Park during the Japan Open tennis tournament in Tokyo on October 6, 2026. (Photo by Rie KIKUCHI / AFP via Getty Images)

Japan's former tennis player Kei Nishikori waves to fans during his tribute ceremony at the Ariake Tennis Forest Park during the Japan Open tennis tournament in Tokyo on October 6, 2026. (Photo by Rie KIKUCHI / AFP via Getty Images)

Japan's Naomi Osaka hits a return to Czech Republic's Karolina Muchova during their women's singles match at the China Open tennis tournament in Beijing on October 6, 2026. (Photo by ADEK BERRY / AFP via Getty Images)

Japan's Naomi Osaka hits a return to Czech Republic's Karolina Muchova during their women's singles match at the China Open tennis tournament in Beijing on October 6, 2026. (Photo by ADEK BERRY / AFP via Getty Images)