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 reacts during the Men's Singles quarterfinal match against Novak Djokovic of Serbia 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 reacts during the Men's Singles quarterfinal match against Novak Djokovic of Serbia 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: Novak Djokovic of Serbia returns a shot against Alexander Zverev of Germany 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: Novak Djokovic of Serbia reacts during the Men's Singles quarterfinal match against Alexander Zverev of Germany 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: Novak Djokovic of Serbia reacts during the Men's Singles quarterfinal match against Alexander Zverev of Germany 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: Novak Djokovic of Serbia reacts during the Men's Singles quarterfinal match against Alexander Zverev of Germany on day five of China Open at the National Tennis Center on October 04, 2026 in Beijing, China. (Photo by Emmanuel Wong/Getty Images)

Serbia's Novak Djokovic hits a return 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)