Jannik Sinner kicked off his 41st week as ATP world No. 1 on Monday, joining Andy Murray as the 14th player since 1973 to hit that mark. The 23-year-old Italian is set to overtake Murray’s 41 weeks next week, inching closer to Gustavo Kuerten’s 43-week reign. With rivals Alexander Zverev and Carlos Alcaraz fading in the rearview, Sinner’s throne looks secure until his return.
The three-time Major champ’s 2024 took a hit when he tested positive twice for the banned steroid Clostebol in March. After months of scrutiny, he struck a deal with the World Anti-Doping Agency (WADA), accepting a three-month suspension that sidelined him from four Masters 1000 events. He’ll be back swinging at the Rome Masters in May.
Since late 2023, Sinner’s been a juggernaut, racking up 93 wins in his last 100 matches. He closed that year by toppling Novak Djokovic twice in two weeks, landing in the top 4. Then 2024 hit—73-6, eight titles, pure dominance. He snagged two Majors, the ATP Finals, and three Masters 1000s. His first big crown came at the Australian Open, outlasting Djokovic and Daniil Medvedev. Rotterdam and Miami followed, cementing his ATP Race lead.
Clay brought hiccups—hip trouble slowed him—but he rallied to the Roland Garros semis, only to falter against Alcaraz after leading two sets to one. Still, he’d piled up enough points to dethrone Djokovic, becoming the 29th No. 1 in ATP history. His first title as top dog came in Halle, though Wimbledon ended in a five-set quarterfinal loss to Medvedev.
Opting out of the Paris Olympics, Sinner roared back on hard courts, claiming Cincinnati and rolling into the US Open as the man to beat. Despite the doping cloud, he dispatched Jack Draper and Taylor Fritz for his second Major. Shanghai saw him top Djokovic again for another Masters 1000, and at the ATP Finals in Turin, he steamrolled five foes in straight sets for 1500 points and his eighth title. He capped it by leading Italy to a Davis Cup title defense in Malaga.
In 2025, the defending Australian Open champ was untouchable in Melbourne, dropping just two sets en route to his third Major at 23. He sealed it with a 6-3, 7-6, 6-3 takedown of No. 2 Zverev, flexing his reign. Off-court, though, the doping saga lingered. After nearly a year of heat, Sinner’s WADA deal meant a February 9 to May 4 suspension, costing him 1600 points and cracking the door for rivals. But Zverev stumbled early, and Alcaraz couldn’t defend Indian Wells, leaving Sinner’s lead intact—for now.
