Alcaraz’s defeat to Norrie leaves the door open for Sinner to claim the year-end No 1, setting up a tense showdown in Turin.

Former TCU tennis star Cameron Norrie picked up what he called the best win of his career Tuesday, beating the world’s No. 1-ranked player, Carlos Alcaraz, 4-6, 6-3, 6-4 in the second round of the Paris Masters.

Carlos Alcaraz's Paris Masters campaign ended earlier than expected. World no. 1 fell to Cameron Norrie 4-6, 6-3, 6-4 in two hours and 22 minutes in the second round, experiencing another early defeat at the final Masters 1000 event of the season.

Jannik Sinner and Carlos Alcaraz are set for a potential showdown in the Paris Masters final, with both players coming in as the top seeds. This year has clearly favoured Alcaraz, who has come out on top in seven of their last eight encounters.

Alcaraz is now stuck at 11,250 points, and Sinner, who didn't play in Paris last year, will keep adding to his 10,510 points with every win—10,600 for reaching the third round, 10,700 for reaching the quarterfinals, 10,900 for reaching the semifinals, 11,150 for reaching the final and 11,500 for winning the title.