Heather Watson and Johanna Konta led Great Britain to a second successive 3-0 win at the Fed Cup in Estonia.
Britain is now set to go into their final match against Turkey on Friday.
Victory would guarantee their place in the promotion play-offs on Saturday, when they would face the winners of Pool B.
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Headline Fed Cup: Britain beats Portugal 3-0
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Heather Watson and Johanna Konta led Great Britain to a second successive 3-0 win at the Fed Cup in Estonia.
Britain is now set to go into their final match against Turkey on Friday.
Victory would guarantee their place in the promotion play-offs on Saturday, when they would face the winners of Pool B.