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)

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)

Germany's Alexander Zverev serves 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)

Germany's Alexander Zverev reacts during his men's singles quarter-final 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)

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)

BEIJING, CHINA - OCTOBER 04: Novak Djokovic of Serbia reacts against Alexander Zverev of Germany in 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 Lintao Zhang/Getty Images)

BEIJING, CHINA - OCTOBER 04: Novak Djokovic of Serbia reacts against Alexander Zverev of Germany in 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 Lintao Zhang/Getty Images)

BEIJING, CHINA - OCTOBER 04: Novak Djokovic of Serbia reacts against Alexander Zverev of Germany in 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 Lintao Zhang/Getty Images)