Great Britain's hopes of reaching the Billie Jean King Cup final for the first time since 1981 rest on the outcome of a deciding doubles after Katie Boulter lost her singles match against Slovakia.
British number two Emma Raducanu put her team in command with a 6-4 6-4 victory over Viktoria Hruncakova in Tuesday's semi-final.
Boulter looked to secure their place in Wednesday's final by beating Slovakian number one Rebecca Sramkova afterwards.
But Britain's leading singles player lost 2-6 6-4 6-4 as the best-of-three tie went the distance.
Heather Watson and Olivia Nicholls have been called upon for the first time this week, taking on Slovakian pair Hruncakova and Tereza Mihalikova.