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 will be live on BBC Two and the BBC Sport website from 13:00 GMT.
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After his match, Norrie said: “In the fifth set I went to serve and there was an eruption of noise and I thought, this is an incredible experience. I’m so happy. Best day of my tennis career, 100%.
“I couldn’t be happier with my performance today. At the end I just tried to take it point by point and focus on my routines. I was just the better competitor today and that showed. It was an incredible match – I’m going to struggle to sleep tonight for sure.”
Spain looked certain to be heading into the doubles with a 2-0 lead when Bautista Agut, 29, broke to lead 3-2 in the third set. But 22-year-old Norrie played the match of his life to produce an astonishing upset.
He broke three times in the third set and twice each in the fourth and fifth as Bautista Agut wilted under a Norrie onslaught, with the Briton hitting 60 winners – twice as many as his opponent.
GB captain Leon Smith said: “At two sets down, you’re thinking, just keep fighting, keep pride and passion. It’s amazing to see Cam, as a rookie, a debutant, actually wear the opponent down. We’ve had a lot of good moments in Davis Cup and this is one of them right now.
“I’m almost a bit lost for words. All you ask for is that they give their best effort and fight like hell. Cam fully deserves every bit of praise he gets.”