Peter Norfolk clinched gold to secure Britain's first ever Paralympic tennis medal with victory over David Wagner.
Norfolk, the world number one, had been out of action after a cycling accident this summer, but showed an excellent return to form with a 6-3 6-2 win.
The Briton dominated the opening set, building up a 5-1 lead over the American with some neat play.
Wagner began the second set well, but two breaks by Norfolk put him back in the driving seat.
Norfolk's success in the inaugural Paralympic quad tournament was one he had firmly focused on.
"It's an unreal feeling," he said.
"I want to be world number one and I wanted to be Paralympic champion.
"To win the first Paralympic quad tournament makes it all the more special."
Norfolk coped well with the strong swirling wind in the opening set against a player who he has now beaten in their last seven meetings.
After leading 5-1 in the opening set, he was given a scare when he lost his serve when he served for the set.
But he showed his class by recovering to take the set and then break again in the opening game of the second set.
Norfolk kept his cool, even when Wagner threatened a comeback and, cheered on by a huge contingent from Team GB, secured the match.
"To beat David 6-3 6-2 is a great result against a very good player. I think I played the big points well and that is what won me the game," he added.
"This is a superb venue to play in and Greece has done us proud."
Norfolk now has a chance of a second gold when he partners Mark Eccleston in the quad doubles final against Wagner and Nick Taylor.