Zverev's rise to world No 1 arrives under a cloud of doubt

Alexander Zverev was confirmed as the new world No 1 in the ATP rankings on Monday, receiving the trophy at a ceremony in Paris ahead of this week's Masters event, as reported by Yahoo Sports.

The German becomes the 30th man to top the rankings, displacing Jannik Sinner, who drops to second. Carlos Alcaraz remains third, with Ben Shelton fourth and Daniil Medvedev fifth.

"It's incredibly special to celebrate here in Paris, where a couple of months ago I won my first Grand Slam," Zverev said at the presentation, according to Yahoo Sports.

The 29-year-old reached three of the four major finals in 2026, winning his maiden Grand Slam title at the French Open before beating Shelton in the US Open final.

Independent Sport has questioned whether the achievement carries the weight the ranking suggests, framing Zverev's ascent as built on shaky foundations rather than outright superiority over his rivals. The piece points to his long history of faltering in the biggest moments, including blown two-sets leads in grand slam finals against Dominic Thiem at the 2020 US Open and against Alcaraz at the 2024 French Open, as well as the serious ankle injury he suffered in the French Open semi-finals in 2022 that left him requiring a wheelchair to leave the court.

That scrutiny has been sharpened by his form immediately after the promotion was confirmed. Zverev lost in three sets to Alex de Minaur in the Vienna Open semi-final on Saturday, a result that dropped his record against top-10 opposition to 3-9, as detailed by Tennis365.

During that defeat, with Zverev a break down in the first set, he raised objections with the chair umpire over the Dunlop balls being used at the ATP 500 event, asking, "Do you think it's normal to play with these balls in a tennis tournament?" according to Tennis365. It followed earlier criticism he and other players levelled at the Wilson balls and court conditions in Montreal this year.

Speaking to Bild after the Vienna loss, Zverev said: "I started the tiebreak relatively poorly, made a few unforced errors, and then he didn't play his way. That's just how it goes sometimes." He added separately, "I thought the match was okay, but it's been difficult for me to play here this year. The balls and the court are incredibly slow."

Behind the top five, Flavio Cobolli holds sixth place, with Arthur Fills, Frances Tiafoe, Alex de Minaur and Rafael Jodar occupying seventh through tenth after each climbing a spot, per Yahoo Sports. Taylor Fritz, Tommy Paul, Brandon Nakashima, Learner Tien and Alex Michelsen round out the Americans inside the top 50.

Zverev now carries the No 1 ranking into the Paris Masters itself, the tournament where he was handed the trophy, with his recent semi-final exit in Vienna offering an early test of whether the ranking will translate into the sustained big-match form that has eluded him at previous grand slam finals.