Wawrinka's emotional US Open finale ends in defeat to Berrettini

NEW YORK, Aug 31 : Former champion Stan Wawrinka lost to Matteo Berrettini 7-6(4) 7-6(3) 6-0 in the first round of the U.S. Open on Monday, with the 41-year-old Swiss playing his final Grand Slam tournament before retiring at the end of the season.In front of a packed crowd on Grandstand, Wawrinka repeatedly gave his fans reasons to believe before Berrettini found ways to shut the door, as the pair produced another rollercoaster after their dramatic clash at this year's Wimbledon.The 2016 champion fell behind early but sparked the crowd into life, breaking to love when Berrettini served for the opening set to pull level.Wawrinka then earned a set point in a marathon game, but Berrettini survived four deuces to force a tiebreak. The 30-year-old held his nerve again, winning three consecutiv