Jannik Sinner has his first ATP Finals crown firmly in his sights after crushing Casper Ruud 6-1, 6-2 on Saturday to set up a title decider with Taylor Fritz, the man he beat to win the US Open two months ago.Fifth-ranked Fritz is the first US man to make the final since James Blake in 2006 after a thrilling 6-3, 3-6, 7-6 (7/3) triumph over world number two Zverev.