TORONTO — Jessica Pegula, the No. 3 seed and the sixth-ranked WTA Tour player, defended her National Bank Open women’s singles title by defeating Amanda Anisimova 6-3, 2-6, 6-1 in Monday’s all-American final. Monday’s match marked just the second time the final of a WTA 1000 event — one step below the sport’s four Grand Slams — has featured two …