Johanna Konta and Heather Watson secured Great Britain another victory in their Fed Cup campaign after winning both of the singles rubbers against Latvia in Tallinn.
Britain, under the leadership of new captain Anne Keothavong, had opened their Euro/Africa Zone Group I Pool C round-robin fixtures by completing a 3-0 whitewash of Portugal on Wednesday.
Another dominant display followed on Thursday morning as first Watson, the British number two, saw off Diana Marcinkevic 6-3 6-0 in a little over an hour.
Konta, who as world number 10 is the highest ranked player in the zonal group, then continued the momentum with a 6-2 6-3 win against Jelena Ostapenko.
After coasting through the first set, Konta, who reached the quarter-finals of the Australian Open, faced a more determined Ostapenko as the world number 35 looked to force home some break chances of her own.
However, Konta managed to hold and subsequently broke the 19-year-old again to move 4-1 ahead before serving for the match.
Ostapenko, though, broke back at 5-2 only to see Konta rally from love-40 down and secure victory against the serve.
Great Britain, seeded third of the 14 nations competing in Estonia, will take an unassailable 2-0 lead into the doubles rubber, where Laura Robson later teams up with Jocelyn Rae against Ostapenko and Marcinkevic.
The final Pool C fixture is against Turkey on Friday.
Should Keothavong's squad secure top spot, they would then play off against the winners from Pool B on Saturday for the chance to progress to a World Group II promotion play-off in April.
Watson, 24, believes squad unity has been the key to a successful start under Keothavong, who took over as Fed Cup captain from Judy Murray.
"It is really fun. Last night we played 'heads up', which is one of my favourite games," Watson said in a video interview with British Tennis on Twitter.
"There is a lot of banter flying about so I am enjoying it."
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