Petra Kvitova underlined her status as one of the French Open title favourites with a 6-2 6-4 win over China's Zhang Shuai in the fourth round.
The seventh seed, who has yet to drop a set at the tournament, needed 85 minutes to see off the 31-year-old.
The Czech got on top of Zhang by breaking at the start of both sets, two of her four breaks during the match.
She was broken only once herself - while serving for the match - but then got over the line in the 10th game.
The 30-year-old is into the last eight at Roland Garros for the first time since 2012 and will now face German Laura Siegemund, who beat Spain's Paula Badosa 7-5 6-2.