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)

Serbia's Novak Djokovic (R) and Germany's Alexander Zverev argue with the referee 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)

Australia's Alex de Minaur hits a return to Russia's Andrey Rublev during their men's singles quarter-final at the China Open tennis tournament in Beijing on October 4, 2026. (Photo by GREG BAKER / AFP via Getty Images)

Serbia's Novak Djokovic (R) argues with the referee during his men's singles quarter-final 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)

Australia's Alex de Minaur hits a return to Russia's Andrey Rublev during their men's singles quarter-final at the China Open tennis tournament in Beijing on October 4, 2026. (Photo by GREG BAKER / AFP via 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)

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)

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)