New York: Dominic Thiem produced a historic comeback to beat Alexander Zverev in a nervy five-setter and win the US Open on Sunday for his first Grand Slam title. The second seeded Austrian beat the fifth seed 2-6, 4-6, 6-4, 6-3, 7-6 (8/6) in 4-hour 2-minute inside a near-empty Arthur Ashe Stadium. It marked the…