Venus Williams cruised into the last eight of the Taiwan Open after seeing off Urszula Radwanska in straight sets.
Radwanska was no match for the top-seeded Williams, who posted a 6-4 6-2 victory on Thursday.
Williams made swift exits at the ASB Classic and Australian Open last month, eliminated in the first round of both tournaments.
But the former world number one has stepped up her game since leading the United States in last week's Fed Cup, where she won both her singles matches against Poland.
And she got the better of another Polish opponent, this time against Radwanska - the sister of world number four Agnieszka - in Taiwan after claiming five breaks of serve throughout a contest nearing an hour and a half.
Williams will meet Anastasija Sevastova for a spot in the semi-finals.
Misaki Doi - the Japanese second seed - also progressed from her second-round clash with Magda Linette.
Doi eased past the Pole 6-2 6-3 in a little over an hour on the hard courts, despite tallying six double faults.
The straight-sets victory earned Doi a match against compatriot and seventh seed Kurumi Nara.
Elsewhere, Stefanie Voegele will play third seed Yulia Putintseva in the quarters following her 6-4 6-4 win over Zheng Saisai and sixth seed Hsieh Su-wei defeated Mandy Minella 6-4 4-6 6-2 to book a clash with Elizaveta Kulichkova.