Emma Raducanu won on her Billie Jean King Cup debut to haul Great Britain level with the Czech Republic and leave the qualifying tie delicately poised.
Raducanu, 19, was playing her first senior match on clay, adjusting well to the surface to win 7-5 7-5 against world number 50 Tereza Martincova.
The US Open champion levelled the best-of-five tie after Harriet Dart lost 6-1 6-0 to Marketa Vondrousova.
The nations play two singles matches on Saturday, plus a doubles if needed.
The winners will qualify for November's finals, while the runners-up face a play-off tie the same week.