Top-seeded Coco Gauff routed Yafan Wang 6-4, 6-2 on Thursday in the second round of the National Bank Open. Preparing for her U.S. Open title defense, Gauff played her first hard-court match since the Miami Open in April. “Happy to get pushed through.” In the night session, second-seeded Aryna Sabalenka, the Australian Open winner, beat Yue Yuan 6-2, 6-2. Kasatkina …