PARIS (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.

More than half of Gauff's points came from Australian Open champion Keys' soft mistakes and the world number two got away with a total of 10 double faults.

The 21-year-old will need to make dramatic adjustments when she faces either France's Lois Boisson or Russian sixth seed Mirra Andreeva for a place in Sunday's final.