Kiki has gone for a Bertens

BELGIAN No.2 seed Elise Mertens and Dutch third seed Kiki Bertens suffered surprise defeats in the Libema Open.

Mertens lost 7-5 6-3 to German qualifier Antonia Lottner, while her fellow Belgian Kirsten Flipkens defeated Bertens 6-4 6-7 6-1.