Great Britain's Cameron Norrie came from two sets down to stun Roberto Bautista Agut and level the Davis Cup World Group tie with Spain at 1-1.
Norrie, ranked 114, fought brilliantly to win 4-6 3-6 6-3 6-2 6-2 against the world number 23 on clay in Marbella.
Earlier, Liam Broady performed well but lost 6-3 6-4 7-6 (8-6) to world number 21 Albert Ramos-Vinolas.
Jamie Murray and Dominic Inglot face Feliciano Lopez and Pablo Carreno Busta in Saturday's doubles rubber.
The match is live on BBC Two and the BBC Sport website from 13:00 GMT.