Johanna Konta and Heather Watson were victorious again as Great Britain beat Estonia to progress through to a Fed Cup play-off on Saturday.
Konta and Watson both won their singles matches as Britain saw off Portugal 3-0 on Wednesday, and the pair were triumphant again on Friday against host nation Estonia in Tallinn.
After Watson had thrashed 15-year-old Katriin Saar 6-1 6-1 in just 57 minutes first up, Konta emerged victorious in a much tougher encounter with world No 27 Anett Kontaveit to earn Britain an unassailable 2-0 lead in the tie.
Konta served twice for the first set but ended up losing it on a tie-break as Estonia, who also beat Portugal in their opening match, drew first blood.
However, world No 11 Konta hit back and eventually clinched a 6-7 (5/7) 6-4 6-2 victory to send Britain through to a play-off, where they will face the winner of Group C.
If Anne Keothavong's team win that tie then they qualify for the World Group II play-offs in April.
Britain have made it to the World Group II play-offs three times in the last six years - including last year against Romania - but were beaten on each occasion.
Britain have not played in the Fed Cup World Group since 1993.
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