Emma Raducanu won on her Billie Jean King Cup debut to give Britain a crucial point in their qualifier against the Czech Republic with a hard-fought 7-5, 7-5 win over Tereza Martincova in windy conditions in Prague on Friday. US Open champion Raducanu, 19, was playing her first professional match on clay and gradually adjusted to the surface as she battled back in both sets to level the best-of-five tie after Harriet Dart lost 6-1, 6-0 to Marketa Vondrousova. Raducanu was trailing 4-5 and saved a set point before winning three games on the bounce to take the opening set.