Russia's Maria Sharapova beat Czech Republic's Karolina Pliskova 6-3 6-4 to level the Fed Cup final at 1-1.
World number four Sharapova hit nine double faults in the match, but broke back twice in the second set, while Pliskova squandered three break points.
Earlier, world number six Petra Kvitova came from a set down to beat Anastasia Pavlyuchenkova 2-6 6-1 6-1.
Kvitova, who helped the Czechs win the 2014 title, faces Sharapova on Sunday before Pliskova meets Pavlyuchenkova.
Should the teams still be level after that, a doubles rubber will decide the tie.