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.

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

New Delhi: Top seed Coco Gauff tumbled out of the National Bank Open after being upset by Canadian teenager Victoria Mboko. Mboko won 6-1, 6-4 in an hour and 22 minutes to move to the quarter-finals, becoming the youngest woman to make the last eight in Montreal, since Gauff three years ago.