Jannik Sinner has defeated Taylor Fritz 6-3, 6-4, 7-5 with a relentless baseline game to win the U.S. Open men’s championship less than three weeks after being exonerated in a doping case. The No. 1-ranked Sinner is a 23-year-old from Italy whose victory Sunday gave him the second Grand Slam trophy of his nascent career. The other was at the Australian Open in January. Sinner also prevented No. 12 Fritz from ending a major title drought for American men that has lasted 21 years. Andy Roddick’s triumph at Flushing Meadows in 2003 was the last Slam title for a man from the United States.