Gauff's serve changes are still embedding into her tennis. But she has other ways to win when the double faults start.

America’s Coco Gauff started her campaign in Toronto in style as she defeated fellow countrywoman Danielle Collins in the round of 64 of the Canadian Open on Tuesday.

It’s not often that the world No. 2 goes two months without winning a match, but that’s the reality Coco Gauff was facing late Tuesday night in Montreal, on the cusp of a third consecutive loss, this time in her opening duel at the Canadian Open.