Alexander Zverev is guaranteed to finish the 2026 season as the world number one after Carlos Alcaraz’s surprise defeat in the Shanghai Masters.

German Zverev was on course to climb above current world number one Jannik Sinner, who has been ruled out for the rest of the year with a knee injury.

Alcaraz still had a mathematical chance of stopping Zverev until he was beaten 7-5 7-6 (7-4) by Belgium’s Zizou Bergs in the third round on Monday.

“It’s been a fantastic season for me. Knowing that I will finish the year on top of the rankings is just a dream come true,” said Zverev.

After losing three major finals, Zverev landed the first Grand Slam title of his career by winning the French Open in June, and followed that with victory at the US Open last month.

The 29-year-old has taken advantage of the injury problems suffered by Spaniard Alcaraz and Italian Sinner – the dominant pair on the ATP Tour in the previous two seasons – to become the world’s leading player.

Zverev cannot overtake Sinner until 2 November at the earliest.

He will become the first German to end the year as number one, and the oldest player to achieve the feat for the first time.

After suffering a serious ankle injury in the 2022 French Open semi-finals which kept him out for seven months, Zverev regained his place in the upper echelons of the sport and been ranked inside the top four continuously since March 2024.

“So much work and effort have been put into achieving this goal, especially after coming back from the ankle injury. I look forward to finishing the season in style,” he said.