Johanna Konta held her nerve to secure victory for Great Britain over Slovenia in their first home Fed Cup tie for 26 years.
Britain's world number 39 saved three set points in a tense first-set tie-break, before eventually beating Dalila Jakupovic 7-6 (9-7) 6-2.
Earlier, Katie Boulter gave GB a winning start by overcoming 18-year-old Kaja Juvan 6-4 6-2 in Bath.
Those wins gave GB an unassailable 2-0 lead in the round-robin tie.
GB are bidding to reach the World Group II play-offs for a third consecutive year.
There are eight teams - split into two groups - taking part in the Europe/Africa round-robin event in Bath between Wednesday and Saturday, with only one side able to progress to April's play-off event to fight for promotion to the second tier.