Cameron Norrie survived a scare against world number 545 Tomasz Berkieta to give Great Britain a 1-0 lead over Poland in the Davis Cup.
World number 34 Norrie saved set points in a nervy first set but recovered to win his nation's opening World Group 1 match 7-6 (11-9) 6-4 in Gdynia, Poland.
World number 227 Arthur Fery, 23, will make his Davis Cup debut in the second match against Olaf Pieczkowski, ranked 484, after British number three Jacob Fearnley pulled out with a rib injury.
The overall winners of the tie, taking place on Friday and Saturday, will play in next February's first round, and therefore have a shot at winning the title in 2026.