BEIJING, CHINA - OCTOBER 04: Alexander Zverev of Germany in action against Novak Djokovic of Serbia in the Men's singles quarterfinals on day five of China Open at the National Tennis Center on October 04, 2026 in Beijing, China. (Photo by Yanshan Zhang/Getty Images)

Germany's Alexander Zverev reacts during his men's singles quarter-final match against Serbia's Novak Djokovic at the China Open tennis tournament in Beijing on October 4, 2026. (Photo by Pedro PARDO / AFP via Getty Images)

Serbia's Novak Djokovic gets ready to serve to Germany's Alexander Zverev during their men's singles quarter-final at the China Open tennis tournament in Beijing on October 4, 2026. (Photo by Pedro PARDO / AFP via Getty Images)

Germany's Alexander Zverev hits a return to Serbia's Novak Djokovic during their men's singles quarter-final at the China Open tennis tournament in Beijing on October 4, 2026. (Photo by Pedro PARDO / AFP via Getty Images)

Serbia's Novak Djokovic reacts during his men's singles quarter-final match against Germany's Alexander Zverev at the China Open tennis tournament in Beijing on October 4, 2026. (Photo by Pedro PARDO / AFP via Getty Images)

BEIJING, CHINA - OCTOBER 04: Alexander Zverev of Germany and Novak Djokovic of Serbia react during the Men's Singles quarterfinal match on day five of China Open at the National Tennis Center on October 04, 2026 in Beijing, China. (Photo by Emmanuel Wong/Getty Images)

BEIJING, CHINA - OCTOBER 04: Alexander Zverev of Germany and Novak Djokovic of Serbia react during the Men's Singles quarterfinal match on day five of China Open at the National Tennis Center on October 04, 2026 in Beijing, China. (Photo by Emmanuel Wong/Getty Images)

BEIJING, CHINA - OCTOBER 04: Alexander Zverev of Germany in action against Novak Djokovic of Serbia in the Men's singles quarterfinals on day five of China Open at the National Tennis Center on October 04, 2026 in Beijing, China. (Photo by Yanshan Zhang/Getty Images)