France, Oct. 14 -- Zverev, the world number two, was already on course to reach the top of the ATP rankings for the first time, as world number one Jannik Sinner is out injured.

Carlos Alcaraz's defeat by Zizou Bergs leaves the world number three too far behind to overtake Zverev, who will officially become world number one on 2 November.

"It's been a fantastic season for me," said Zverev, who won his first Grand Slam title at the French Open in Paris in June.

A month later, he reached his first Wimbledon final but lost to Sinner in four sets.

In September, he beat home favourite Ben Shelton in four sets in New York to win the US Open for the first time.

Winner of 26 titles

The German, who has won 26 titles since turning professiona...