Johanna Konta and Heather Watson led Great Britain a step closer to the Fed Cup World Group II play-offs with victory over Estonia in a round-robin tie in Tallinn.
Watson beat Katriin Saar 6-1 6-1 in their Pool B match.
Konta survived a scare before seeing off Anett Kontaveit 6-7 (5-7) 6-4 6-2.
The British team face the winners of Pool C, Hungary, on Saturday to try to secure a place in April's World Group II play-off for a fourth time.
They narrowly missed out on making the competition's elite tier after losing to Romania last year, with similar defeats coming in 2012 and 2013.