Jannik Sinner's 2026 season is officially over. The South Tyrol tennis player announced on social media that he will undergo treatment for a knee injury that has sidelined him since his Wimbledon final victory on 12 July. The decision means he forfeits the ATP Finals in Turin and will almost certainly lose his world number one ranking to Germany's Alexander Zverev by the end of the year.
Sinner currently leads the ATP standings with 11,180 points, but he will drop 3,050 points from tournaments he cannot defend: Shanghai (50), Vienna (500), Paris (1,000) and the ATP Finals in Turin (1,500), which he won unbeaten last year. That leaves him at 7,950 points. Zverev, with 9,720 points today, has only 980 to defend across the same events. Even if the German wins no further matches this season, he finishes the year on 8,740 — 790 points ahead of Sinner. The mathematical certainty means Zverev will occupy the top spot for the first time in his career.
A conservative treatment path
Sinner's team ruled out surgery. The diagnosis is inflammation involving the iliotibial band, a thick tract of tissue running along the outside of the thigh, often called "runner's knee" for its prevalence among runners. Professor Alessandro Massè, director of orthopaedics at the CTO hospital in Turin, explained to ANSA that the condition tends to become chronic and usually stems from running and frequent changes of direction — stresses familiar to a tennis player at Sinner's level.
"It's a rehabilitation path, not a surgical one," Massè said. Sinner will undergo muscle elongation exercises and work to prevent loss of muscle tone during the long stoppage. The priority is to prevent the condition from calcifying and requiring surgery later.
Sinner explained his decision in a video posted to his social channels: "Together with the doctors we decided that I need a cycle of treatments for my knee, which means my 2026 season is officially over. I have to think about my long-term career and get back to 100%."
Federation and peers respond
Angelo Binaghi, president of the Italian Tennis Federation (FITP), backed the decision. "Protecting Jannik's physical integrity comes before any result and any competitive commitment," Binaghi said. "The federation will be by his side, as always."
Adriano Panatta, the 1976 French Open champion and a commentator on Italian tennis, urged patience. "I don't know exactly what he has... but when health is involved, an athlete at that level must have the patience to recover properly, to stop, without forcing the timing," Panatta told ANSA. "Jannik is young, he has many years ahead of him, and I'm convinced he'll come back stronger than before."
What the ranking shift means
The ATP rankings operate on a rolling 52-week cycle. Points earned at tournaments drop off after one year and are replaced by new results. Because Sinner won so much late in 2025 — Vienna, Paris and the ATP Finals — he had a mountain of points to defend. Zverev, by contrast, had modest results in that same stretch last season and therefore little to lose.
Carlos Alcaraz, who won in Tokyo last week, sits third with more than 4,000 points separating him from Zverev. The Spaniard cannot reach number one before the season ends. Zverev's ascent is now a matter of when, not if — Vienna later this month is the first tournament where the mathematics could confirm it.
Turin prepares without its champion
The ATP Finals, scheduled from 15 to 22 November at Turin's Inalpi Arena, will proceed without the player who won the 2025 title on home soil. Sinner's absence has triggered movement on secondary ticket markets, with some fans offering seats for sale on social media groups. However, local business associations Ascom and Confesercenti said the event has outgrown reliance on any single player. The 2025 edition generated an estimated €591M in total economic impact for the Turin area, with ticket revenue reaching €34M.
Turin's mayor Stefano Lo Russo and Piedmont's president Alberto Cirio both stressed that the tournament remains a major draw. The absence of Sinner "reopens the competition" among international champions, Cirio noted, making the Finals "even more uncertain and, for that reason, compelling and unpredictable."
Two players have already qualified: Zverev and Alcaraz. Italy's hopes now rest on Flavio Cobolli, who sits fifth in the PIF ATP Live Race to Turin with 3,640 points. Cobolli reached the French Open final this year and won an ATP 500 title in Acapulco. The top seven in the race after the Paris Masters qualify automatically; the eighth spot goes to a 2026 Grand Slam champion ranked between 8th and 20th, or to the eighth-ranked player if no such champion exists.
A 2026 of glory and questions
Sinner finishes the year with a 44–3 record, titles at the Australian Open and Wimbledon, and an unprecedented streak of five consecutive Masters 1000 titles: Indian Wells, Miami, Monte Carlo, Madrid and Rome. His last match remains the Wimbledon final victory. But the season also brought concerns: cramps at Melbourne, a shock physical episode against Cerundolo at Roland Garros, and now three months of uncertainty over the knee injury that has finally forced a complete shutdown.
Sinner thanked fans for their support: "The end of the last two seasons, especially in Turin, gave me beautiful emotions. This year will be different, but now I need to think about my long-term career. I'll do everything to return to 100%."
