There was a sense of deja vu as Clara Tauson upset fourth seed Ekaterina Alexandrova at the Luxembourg Open.
The 18-year-old defeated the same opponent en route to claiming a maiden WTA Tour title in Lyon in March and repeated the feat here, again on an indoor court.
On this occasion, Tauson needed to come back from a break down in the deciding set to clinch a 6-4 3-6 7-6 (7-1) triumph and book her spot in the quarter-finals.
Fifth seed Marketa Vondrousova had no such trouble, the Czech a comfortable 6-2 6-4 victor over Jana Fett. Alize Cornet (8) also made the last eight with a 6-3 6-3 win over Mandy Minella, while Ludmilla Samsonova (7) needed a pair of tie-breaks to overcome Oceane Dodin.
In the first round, Zhang Shuai (6) lost in three sets to Marie Bouzkova.
At the Zavarovalnica Sava Portoroz in Slovenia, second seed Yulia Putintseva was a 6-3 6-1 winner over Katie Boulter. Alison Riske, Kristina Mladenovic and Lucia Bronzetti also made it through.