Jannik Sinner has path to World No. 1 in Paris after Carlos Alcaraz’s shock loss | ATP Tour

PIF ATP Live Rankings Projection

Alcaraz loss opens door for Sinner’s shot at World No. 1 in Paris

Sinner’s 65-week debut reign as World No. 1 ended after the US Open

October 28, 2025

Jannik Sinner’s quest to replace Carlos Alcaraz as World No. 1 this week came into much sharper focus Tuesday following the Spaniard’s shock three-set loss to Cameron Norrie at the Rolex Paris Masters.

The Italian now controls his own destiny, guaranteed to return top spot in the PIF ATP Rankings on Monday should he win the ATP Masters 1000 title, played for the first time this year at La Défense Arena.

Sinner’s debut 65-week reign as World No. 1 ended after the US Open, where his defeat to Alcaraz in the final saw the six-time Grand Slam champion return to No. 1.

Should Sinner win the Paris title for the first time, he will return to World No. 1 for just one week before handing it back to Alcaraz ahead of the Nitto ATP Finals, where he will drop the 1500 points earned by winning last year’s season finale on home soil.

Alcaraz’s unexpected defeat to Norrie – which ended his 17-match winning streak at Masters 1000 events – will also have a major impact on the battle for ATP Year-End No.1 presented by PIF honours should Sinner close out the season by winning Paris and successfully defending Turin.

If Sinner wins Paris, he will claw to within 1,050 points of the Spaniard in the PIF ATP Live Race to Turin. With neither player scheduled to compete the week before the season finale, should Sinner then emerge an undefeated champion at the Inalpi Arena for the second consecutive year, Alcaraz would need to pick up 450 points at the Nitto ATP Finals to end the year No. 1.

Under that scenario, Alcaraz would need to reach the final with at least one group stage win or go undefeated in group stage play. 

Sinner, who won his 22^nd title Sunday in Vienna, begins his quest for his first Paris crown Wednesday against Belgium’s Zizou Bergs.