BASTAD, Sweden (AP) Fourth-seeded Annika Beck beat Romania's Sorana Cirstea 7-5, 7-5 to advance to the second round of the Stockholm Open on Tuesday, and turn the page on a shock defeat in Switzerland last week.

The German player came through a difficult first match since losing to world No.797 Rebeka Masarova in the Ladies Championship Gstaad.

''It was quite a tough match. I expected it, because Sorana is a great player and she had some great results on clay this year,'' Beck said. ''It was the first time I ever played her, but I got some tactics off my coach and I knew what to do.''

Second-seeded Sara Errani of Italy beat Cagla Buyukakcay of Turkey 6-2, 6-3 and Laura Siegemund of Germany defeated Kateryna Kozlova of Ukraine 6-1, 6-2.

In other first-round matches, American Bethanie Mattek-Sands defeated third-seeded Kiki Bertens of the Netherlands 7-5, 6-2, and seventh-seeded Yaroslava Shvedova of Kazakhstan retired with a back injury in the third set to give Mona Barthel of Germany a 4-6, 6-3, 3-0 win.

In an all-Swedish contest, eighth-seeded Johanna Larsson beat Rebecca Peterson 7-6 (3), 6-2, and in a Baltic clash Anastasija Sevastova of Latvia defeated Anett Kontaveit of Estonia 6-2, 6-4

Julia Goerges of Germany ousted Polona Hercog of Slovenia, 6-7 (7), 6-3, 6-4 and Viktorija Golubic of Switzerland beat Elizaveta Kulichkova of Russia 7-6 (5), 6-1.

Lucie Hradecka, Sara Sorribes Tormo, Lara Arruabarrena and Katerina Siniakova also advanced.

This story has been corrected to show that last week's tournament in Gstaad was the Ladies Championship Gstaad and not the Swiss Open.