The Czech Republic reached the Fed Cup final after completing a 3-1 win over Germany in Stuttgart on Sunday.
Petra Kvitova hammered Angelique Kerber 6-2 6-2 to seal a place in the November showpiece.
Julia Goerges had earlier beaten Karolina Pliskova 6-4 6-2 to give Germany renewed hope after the Czechs took a 2-0 lead on Saturday when Kvitova beat Goerges and Pliskova defeated struggling former world No.1 Kerber.
France and defending champions the United States are level at 1-1 in the other semi.
Kristina Mladenovic prevailed over CoCo Vandeweghe after fighting back from a set down to bring France level with defending Fed Cup champions the US in Aix en-Provence.
Vandeweghe, who was unbeaten in 13 Fed Cup rubbers, stormed to the first set in 30 minutes but Mladenovic secured double breaks in the following two sets to earn a 1-6 6-3 6-2 victory and level their semi-final tie at 1-1.
“Extremely difficult start at 6-1 down,” said the 24-year-old Mladenovic.
“I was just hanging in there, fighting and mixing it up, trying to be aggressive before her, which is not easy.”
Mladenovic enjoyed a surge of success in the second set with an excellent slice drop shot to run into a 3-0 lead in 13 minutes. Vandeweghe broke back to level the scores at 3-3 before a searing forehand from the Frenchwoman helped her to break again and force a deciding set.
Mladenovic used her momentum to earn a double break on Vandeweghe’s serve with a string of winners that allowed her to serve out the match.
“I am happy we are equal tonight and ready for some more fights tomorrow,” Mladenovic added.
“I am not afraid at all. I am super pumped. I am here to defend and represent my country the best I can and we will continue fighting.”
Mladenovic will face Sloane Stephens in the opening rubber on Sunday.
Stephens, the 25-year-old US Open champion, also came through a tough opening match with France’s Pauline Parmentier as she fought from 5-1 down in the opening set to win 7-6 7-5.
“I didn’t play my best tennis but all I could do was fight back, keep the balls in the court and play for every point with my best effort,” Stephens said.
