Thursday, 9 Feb 2017 : Singles wins for Heather Watson and Johanna Konta, and a doubles victory for Jocelyn Rae and Laura Robson, gave Britain a 3-0 win in Group C.
They go on to face Latvia on Thursday and Turkey on Friday, with the group winners earning a play-off against the Group B winners on Saturday.
The winners of that tie will progress to a World Group II play-off in April.
Britain are seeded third among the 14 nations in Tallinn and first in their group, and Portugal were unable to overcome the gap in rankings.
Watson, the world number 72, began with a 57-minute 6-1 6-1 win over Ines Murta, ranked 546th.
World number 10 Konta then saw off 246th-ranked Michelle Larcher de Brito 6-2 6-4 to clinch the tie.
Rae and Robson beat De Brito and Murta 6-2 6-3 in the concluding doubles match.
“I’m really happy to have got the match under my belt,” said Konta. “It was a high-level match, and it got better and better as the match went on. She made me work for it in the end and I’m really happy to have come through for the team.
Asked about new captain Anne Keothavong, who replaced Judy Murray in the role at the end of last year, Konta added: “I think she is doing a tremendous job of bringing us together as a team.
“It’s always a tricky one because we spend most of the year as individuals, so for her to do such a good job with us, it says a lot about her.
“We’ve got lots of team bonding in the evenings, lots of funny things going on.”
Watson added: “It’s my first match since the Aussie Open so I’m really happy with the way I played and also to get the first win under the belt for GB.
“It was great having Annie there and she’ll continue to do a great job. So far I’ve really been enjoying the trip with her as captain.”
Britain are likely to face the toughest test of the group stage on Thursday when they take on Latvia, led by world number 35 Jelena Ostapenko, who beat Turkey 2-1 in Wednesday’s other Group C tie.
Source By: Internet