Last year’s losing finalist Taylor Fritz beat Italian Lorenzo Musetti 6-3 6-4 in a dominant display by the American to win his opening round-robin match of the ATP Finals in Turin on Monday. Musetti, a late replacement after the withdrawal of seven-times winner Novak Djokovic, began brightly but started to tire despite the backing of a largely partisan crowd at the Inalpi Arena, and Fritz proved unstoppable once his service game got going. The turning point came in the third game when Fritz saved four break points, serving two aces in the process, and then broke Musetti to lead 3-1. The Italian, who won to love in his first service game, faced break points for the rest of the first set. Story continues below this ad “I did a great job early on in the match to serve my way out of trouble and save some break points,” Fritz said. “I’m really happy. I thought I did a lot of things really well.” Musetti, beaten by Djokovic in an almost three-hour final in Athens on …