Gauff had to overcome 23 double-faults to win for the first time since the French Open final, outlasting fellow American Danielle Collins 7-5, 4-6, 7-6 (2) in the second round of the National Bank Open.

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

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.