Jannik Sinner, the Italian tennis star, secured the year-end No. 1 ranking after a dominant semifinal win over Tomas Machac at the Shanghai Masters. This victory sets him up for a thrilling final clash against Novak Djokovic, who is aiming for his 100th ATP title. Sinner’s remarkable season, marked by six tournament wins including two Grand Slam triumphs, has solidified his position as the top player in the world.