NUREMBERG, Germany — Eugenie Bouchard has withdrawn from the Nuremberg Cup tennis tournament with a right ankle injury.

The 2014 champion informed tournament director Sandra Reichel of her decision late Monday, when an MRT scan showed she had torn a ligament in training the previous week.

The injury put the Canadian's participation in the French Open in doubt.

"She told me she needs a miracle," Reichel said Tuesday. "She sent for her doctor from Canada."

Bouchard was replaced by Julia Glushko of Israel, who lost 6-4, 5-7, 6-0 to the second-seeded Yulia Putintseva.

Defending champion Kiki Bertens won her opening match, beating German wild-card entry Katharina Gerlach 6-2, 6-1. The top-seeded Bertens will next play Annika Beck, who defeated Lena Rueffer 6-3, 6-3.

Fourth-seeded Laura Siegemund saw off fellow German Katharina Hobgarski 6-0, 6-1 to get her campaign underway.

Seventh-seeded Yaroslava Shvedova beat Anna Zaja 3-6, 7-5, 6-1 and Carina Witthoeft defeated Johanna Larsson 6-1, 6-0.

Already in the second round of the French Open warmup, the fifth-seeded Alison Riske of the United States defeated Kirsten Flipkens of Belgium 6-2, 6-2. Riske will next play Bertens or Beck in the quarterfinals.

Sorana Cirstea of Romania also reached the quarterfinals with a 6-0, 6-7(4), 6-3 win over American Varvara Lepchenko.