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.

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

Top-seeded Coco Gauff survived an error-laden second-round test from Danielle Collins, prevailing 7-5, 4-6, 7-6 (2) in an all-U.S. matchup at the Omnium Banque Nationale on Tuesday in Montreal.