Carla Suarez Navarro began her Bucharest Open campaign by thrashing Annika Beck, while Kiki Bertens came through a first-round match at the Ladies Championship Gstaad unscathed.
Suarez Navarro is seeded second in Romania and required under 54 minutes to move past Beck, racing to a 6-0 6-1 victory.
Beck finally got on the board after failing to hold serve five times in succession, ensuring she avoided a double-bagel before the Spaniard wrapped up the win with a break to love.
Ekaterina Alexandrova was the only other seed in action and she had to come from behind to defeat Barbora Krejcikova 4-6 6-0 6-2, while there were also wins for Cagla Buyukakcay, Aliaksandra Sasnovich, Jaqueline Cristian and Nadia Podoroska.
Bertens was not quite as dominant as Suarez Navarro in Switzerland, but a 6-3 6-1 triumph against Aleksandra Krunic ensured safe passage for the number two seed.
The Dutchwoman will face Anna Zaja in the second round after the qualifier surprised Patricia Maria Tig 6-2 6-3.
It was by no means routine for fourth seed Mona Barthel, though, as she was downed 4-6 6-3 6-3 by Maria Sakkari, although Carina Witthoft - seeded sixth - beat Silvia Soler-Espinosa 6-3 7-6 (7-5).