Paris - Former champion Garbine Muguruza made the French Open quarter-finals on Monday when opponent Lesia Tsurenko quit after just two games with a leg injury.
Third seed Muguruza, the 2016 champion, was only on court for 20 minutes.
Tsurenko also needed a medical time-out off court after just the first game.
Muguruza plays two-time champion Maria Sharapova for a place in the semi-finals.