WASHINGTON — A little more than a month ago, Coco Gauff left Wimbledon after a first-round loss that left her dispirited and unsure of what she needed to do. That seems kind of far away after she won the trophy at the very next tournament she entered.
Surging at the end of each set, Gauff defeated Maria Sakkari 6-2, 6-3 in the DC Open women’s final on Sunday for the fourth WTA Tour singles title of her career.
Gauff, a 19-year-old from…