Paris, May 23: Danish tennis star Caroline Wozniacki's French Open preparations suffered a major hit as she was forced to retire at the Internationaux de Strasbourg.

French Open guide

Wozniacki told wtatennis.com: "I felt it kind of in the middle of the first set. At this point, I think it's important for me to try and get ready for the French Open and be 100 per cent for that."

Rogers, the world number 55, won the one set played on a tie-break in just over an hour. She will now play China's Qiang Wang.

Second seed Elena Vesnina also went out after losing 1-6, 6-1, 6-1 to Camila Giorgi.

Fifth seed Caroline Garcia went through with a 6-3, 6-4 victory over Jennifer Brady while seventh seed Daria Gavrilova beat Louisa Chirico 6-2 6-3.

Qualifier Elizaveta Kulichkova also progressed, beating Mandy Minella 6-1, 6-4.

There was another an upset at the Versicherungs Cup in Nuremberg as third seed Zhang Shuai was beaten 6-7, 6-3, 6-4 in a two-hour tussle with France's Oceane Dodin.

Sixth seed and home favourite Julia Goerges saw off Nao Hibino 7-5, 6-1.

Wozniacki is the latest star added to the injury list ahead of the Ronald Garros. Reigning French Open champion Garbine Muguruza and Simona Halep are already on the treatment table and have been working on getting to their full fitness before the French Open.

Muguruza retired down 4-1 in the semifinals in Rome this past weekend, saying she had almost not taken the court following an injury during her pre-match warm-up.

In the Rome final against Elina Svitolina on Sunday, Halep experienced an ankle problem that began in the second set.

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