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

After a month-long hiatus, tennis star Coco Gauff returned to her winning ways at the National Bank Open in Montreal.

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.