They beat Slovakia 3-2 in a very tight match played in Glasgow.
World no. 276 Daniel Evans was the hero of the match, winning both his singles matches and helping GB to get to the second round, where they will play against Belgium.
After the first day of play, the tie was levelled at 1-1. Dan Evans surprisingly beat the Slovak Lukas Lacko in straight sets 6-3 7-5 7-5. Lacko was the favourite before the beginning of the match, having reached the Zagreb Indoors final a week ago. But the Brit put on a strong performance and gave GB the lead.
After Martin Klizan defeated James Ward 6-2 4-6 6-4 7-6 (3), it was all back to square one.
Great Britain, playing without Andy Murray this time, got ahead once again at the end of the second day. Colin Fleming and Ross Hutchins won the doubles against Filip Polasek and Michal Mertinak 6-3 7-6 (4) 0-6 6-3.
The Slovaks fought back when Lukas Lacko showed glimpses of his form from the beginning of this year. He defeated James Ward 7-6 (9) 6-1 6-3 and everything was going to be decided in the final fifth match.
Dan Evans got off to a surprisingly quick start against Martin Klizan, taking the first two sets, losing only two games. But Klizan got back onto his feet and forced a fifth set. Evans managed to regain his focus once again and won the match 6-1 6-1 4-6 3-6 6-3.