Johanna Konta fought back from a set down to beat Maria Sakkari 3-6 6-2 6-3 and give Great Britain an unassailable 2-0 lead against Greece.
The Brit, 27, looked to be the weaker player in the opening set against the rising star from Athens, who struck the ball cleanly and took her chances well.
However, the World No.39 is an experienced Fed Cup campaigner by now, and she turned the match around very impressively to get the win for her team.
Katie Boulter was also given a tough test by Valentini Grammatikopoulou in the opening singles rubber of the tie as she recovered after losing the second set to win 6-3 4-6 6-3.
The British No.2 made an excellent start to the match. She broke immediately and served well to win it comfortably in just 34 minutes.
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