PARIS, June 4 (Reuters) - Coco Gauff huffed and puffed into the French Open semi-finals with a 6-7 (6) 6-4 6-1 victory against fellow American Madison Keys in a match both players will be quick to forget as they broke the 100-unforced errors barrier on Wednesday.

Coco Gauff dropped the first set, but leaned on stellar range and sharp anticipation to edge fellow Madison Keys in an error-clogged All-American meeting Wednesday to reach her third French Open semifinal in four years.