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The Prague tournament - played among the top Czech men's and women's players but without fans and with ball boys and girls wearing gloves and face masks - was one of the first after professional tennis was suspended in early March.
The WTA also announced a revised system for calculating world rankings when the season resumes.
Fourth seed Sofia Kenin claimed her maiden French Open semifinal spot as she fought to a 6-4, 4-6, 6-0 victory over fellow American Danielle Collins.
England made a hugely impressive start to their Euro 2020 qualifying campaign as Raheem Sterling scored a hat-trick in a 5-0 thrashing of a sorry Czech Republic side on Friday.
The five-time world champions were aiming to put Saturday's disappointing 1-1 draw with Panama in Porto behind them but it was the Czechs who initially showed some attacking flair as they created a number of dangerous first-half chances.
Results 21-25
