Petra Kvitova staged an impressive recovery in the first set to overcome former junior Roland-Garros winner Leylah Fernandez 7-5, 6-3.
The Czech had trailed 5-1 in the first set, and saved two set points, before turning the match around with some impressive shot-making in a highly watchable contest on Court Suzanne-Lengle.
This is what we learned from the battle of the two lefties.