Nobody unbeatable anymore, Tiafoe says ahead of US Open semi

This year's US Open has seen 24-time Slam winner and four-time New York champion Novak Djokovic suffer his earliest exit in 18 years. Carlos Alcaraz, the 2022 champion and winner this year at the French Open and Wimbledon, was also a first-week casualty. Five-time US Open champion Roger Federer is long retired while Rafael Nadal, a four-time winner, is 38 and absent from this edition, heading into the twilight of his career. "It was only a matter of time, the game is open. It's not like it once was where you make quarter-finals...