Germany’s Alexander Zverev is set to become the world’s top-ranked men’s tennis player for the first time in his career after defeating Tallon Griekspoor in straight sets to reach the quarter-finals of the Vienna Open on Thursday.
The 29-year-old secured a 6-4, 7-5 victory over the Dutchman, confirming his rise to the summit of the ATP rankings when the updated standings are published on Monday, November 2.
Zverev’s achievement marks another major milestone in a remarkable 2026 season, during which he won the French Open and the US Open to claim the first two Grand Slam titles of his career.
The German had already guaranteed himself the year-end world No. 1 ranking, but his progress in Vienna ensured he would overtake Italy’s Jannik Sinner at the top before the season-ending ATP Finals.
Sinner’s decision to end his season early because of a knee injury opened the door for Zverev, who has consistently delivered strong performances throughout the campaign.
The victory over Griekspoor also made Zverev the 30th man to reach the top of the ATP rankings since their introduction in 1973.
He will become only the second German man to achieve the feat, following Boris Becker, who first occupied the position in January 1991.
Zverev will be 29 years and 196 days old when the new rankings take effect, making him the second-oldest player to reach world No. 1 for the first time, behind Australia’s John Newcombe.
His path to the Vienna quarter-finals, however, has not been entirely straightforward.
In his opening match, Zverev was forced to save four match points against Spain’s Martin Landaluce on Tuesday before escaping with a victory that kept his tournament campaign alive.
He subsequently produced a more composed performance against Griekspoor, taking control early and maintaining his advantage through the decisive moments.
Zverev broke the Dutchman’s serve in the opening game and protected his own service games to secure the first set 6-4.
The second set proved more competitive, with both players holding their ground until the score reached 5-5. Zverev then seized his opportunity, breaking Griekspoor’s serve to move within a game of victory.
The match briefly stopped when a smash from Zverev damaged part of the electronic advertising board behind Griekspoor, causing the equipment to malfunction just as the German approached match point.
After the umpire covered the affected section with a towel, play resumed, and Zverev completed the victory with an unreturnable serve.
The result confirmed his impending rise to the top of men’s tennis, capping a season in which he has combined Grand Slam success with consistency across the tour.
Zverev’s two major titles in Paris and New York have been central to his rise, while his performances in other tournaments have helped him establish a commanding position in the year-end rankings.
For a player who had previously reached as high as world No. 2 without claiming the top spot, the achievement represents the fulfilment of a long-standing career ambition.
With the Vienna Open quarter-finals still ahead, Zverev will now look to maintain his momentum as he prepares for the final stretch of the season.
His elevation to world No. 1 will officially take effect on November 2, ending Sinner’s current spell at the top and placing the German at the pinnacle of men’s professional tennis.
