Katie Boulter was unable to rise to the occasion like she has so often in the past as Great Britain went 1-0 behind in their opening Billie Jean King Cup Finals group tie against Kazakhstan.
Harriet Dart, Britain's leading player in Emma Raducanu's absence, plays Wimbledon champion Elena Rybakina next.
Hosts Britain will lose the best-of-three tie in Glasgow if Dart is beaten.
If world number 98 Dart beats the Grand Slam winner, who is ranked 22nd, then the tie will be settled by the doubles match.
Doubles specialists Olivia Nicholls and Alicia Barnett have been picked by British captain Anne Keothavong and are set to make their debuts in the event.