Alexander Zverev secured the opportunity to take the men’s tennis world number one ranking in the next update by defeating Tallon Griekspoor at the Vienna Open, overtaking Italy’s Jannik Sinner and capping a stellar season that included his first two Grand Slam titles.
The balance of power at the summit of men’s professional tennis shifted in the Austrian capital as Alexander Zverev defeated the 50th-ranked Tallon Griekspoor 6-4, 7-5 to reach the quarter-finals of the Erste Bank Open in Vienna. Although the 29-year-old German was already guaranteed to finish the year leading the ATP rankings, his opening two victories in Vienna ensured he would officially rise to the top spot in the weekly standings.
Zverev."To be on the top of the world is very special. Today I played a very good match and I'm very happy about that.I have to wait a lot, but sometimes you have to wait for the good things in life. 2026 has been amazing". pic.twitter.com/6tQ32k4PEV
How Jannik Sinner’s Injury Cleared the Path for Zverev
Zverev’s ascent to the number one position was accelerated by the absence of the reigning incumbent, Italy’s Jannik Sinner. Sinner decided to end his 2026 season at the start of October due to serious knee problems and pain, leaving him unable to defend ranking points and opening the door for Zverev to overtake him. His stellar campaign of 64 wins out of 80 matches, coupled with two Grand Slam titles, serves as a true reflection of this remarkable milestone.
Capitalizing on that opportunity required surviving a turbulent start in Vienna. Zverev was forced to save four match points against Spain’s Martin Landaluce in his first-round match before finding a steadier rhythm against Griekspoor. Quick off the mark, he broke the 30-year-old Dutchman in the opening game and maintained solid service games to capture the first set before the second frame reached 5-5.
Worth the wait 👏@AlexZverev on becoming the World No. 1 in the PIF World Rankings 🤝 pic.twitter.com/SJEPxEGzwh
Milestones and Historic Precedents in German Tennis
The achievement marks a career milestone for Zverev, who has long been regarded as one of the most talented players of his generation but had previously fallen short of capturing a major singles title. He broke that major duck in 2026 by capturing both the French Open on clay courts and the US Open, and also won a gold medal in the 2021 Olympics. Zverev is the second German man, after Boris Becker, to clinch the top spot in the sport, with Becker having reached No. 1 in 1991.
With his promotion, Zverev becomes only the 30th man to claim the top spot since the ATP rankings were first published in 1973. At 29 years and 196 days old when the updated rankings are published, he becomes the second-oldest first-time number one behind Australian John Newcombe, who achieved the feat at age 30 in 1974. Steffi Graf and Angelique Kerber stand as the sole female tennis players from Germany to reach this milestone within the WTA rankings.
(It is) very special. To have the feeling to be on the top of the world is amazing. It is different than winning a tournament or a title, but it’s such a special feeling to know that the No. 1 is going to be next to your name when the new rankings come out.
A Dramatic Match Point and What Comes Next
The historic win in Vienna did not conclude without a touch of physical comedy.
THE MOMENT IT ALL BECAME REAL 🥹Zverev clinches victory over Griekspoor and secures the World No. 1 ranking for the first time in his career!@ErsteBankOpen | #ErsteBankOpen pic.twitter.com/LTL0e7LlF6
Meanwhile, Zverev remains in Vienna to continue his tournament run and maintain his momentum as he prepares for the season-ending ATP Finals next month.
Elsewhere in the tournament, Carlos Alcaraz moved through to the quarter-finals following a 6-1, 7-6 (13-11) triumph against Nikoloz Basilashvili from Georgia, setting up a next clash with America’s Tommy Paul for a semi-final berth. Fellow former world No. 1 Daniil Medvedev of Russia also advanced successfully by overcoming Britain’s Cameron Norrie across three sets.
Ripping forehands like a world no.1 💪Congrats, @AlexZverev – we can't wait for you to begin your 2027 season at the @BrisbaneTennis. pic.twitter.com/FDppoCfqIw