Top seed Iga Swiatek brushed aside compatriot Magdalena Frech to advance to the last 16 at the Poland Open on Tuesday.

The Warsaw native took 73 minutes to secure a safe passage to the next round with a 6-1 6-2 victory, setting up a clash with Romanian Gabriela Lee – who defeated Raluka Serban on Tuesday.

Swiatek won 76.2 per cent of total service points and won 61.8 per cent of the overall points in the match, with Frech on the back foot throughout, extending her winning streak on clay to 17 matches.

It was Swiatek's first time on the court since defeat at Wimbledon to Alize Cornet, which brought an end to a remarkable 37-match unbeaten run.

Elsewhere, eighth seed Petra Martic overcame Weronika Falkowska 7-5 6-4, while there were also victories for Laura Pigossi, Elisabetta Cocciaretto, Sara Errani and Ana Bogdan.

In the Prague Open, Wimbledon quarter-finalist Marie Bouzkova advanced after a dominant 6-1 6-2 victory against Czech teenager Dominika Salkova - setting up a clash against another teenager, 19-year-old Russian Oksana Selekhmeteva.

There were also victories for Chloe Paquet, Wang Qiang and Magda Linette on day five of the tournament.