Harriet Dart dug deep to beat Linda Fruhvirtova and take Great Britain's Billie Jean King Cup tie against the Czech Republic to a doubles decider.
After Emma Raducanu lost, Dart won 6-0 5-7 6-2 against 16-year-old Fruhvirtova to level the best-of-five tie at 2-2.
Raducanu lost 6-1 6-1 to 2019 French Open finalist Marketa Vondrousova and was hampered by a blister on her foot.
With Raducanu sitting out, Dart is set to lead Britain in the crucial doubles - although she too had a fitness issue.
Dart, 25, seemed to have a problem with her foot in the third set against Fruhvirtova but said after clinching victory she would be "ready if selected".