Despite struggling with an ankle issue, Alexander Zverev overcame Alexander Bublik in two grueling tie-breaks to advance to the quarter-finals of the Shanghai Masters.
Germany's Alexander Zverev has clinched the year-end ATP world number one ranking for the first time in his career, capping off a remarkable season that included Grand Slam victories in Paris and New York.
Novak Djokovic secured the 102nd title of his career and extended his flawless record in Beijing to 34-0 after Alex de Minaur was forced to retire injured during the China Open final.
