Paralympic tennis champion Peter Norfolk beat American world number one David Wagner to win his fourth British Open quad singles title in Nottingham.
Norfolk, the world number two, won the opening set but lost his way in the second before clinching victory on a third-set tie-break 6-1 2-6 7-6 (7-2).
"I was pleased with the first set but I lost focus for a while and David upped his game," Norfolk told BBC Sport.
"But this is the sort of tough match I need ahead of Beijing."
Norfolk made a blistering start against his American rival, whom he had beaten 18 times in 29 games before Sunday, racing into a 4-0 lead and quickly wrapping up the set.
Wagner made a more aggressive start to the second and broke Norfolk to lead 3-1. Norfolk struggled to stay in the set and he was broken again at 5-2 to allow Wagner to level the match.
I thought I could win in two sets and I let my mind wander
Peter Norfolk
Wagner, the defending champion, took an early 2-0 lead in the decider but Norfolk found his range, particularly on the backhand side, and recovered to lead 3-2 with a break before Wagner broke back.
The American took the next two games and was serving for the match but another superb backhand winner from Norfolk gave him a crucial break to keep him in it.
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With the pressure on, Norfolk held at 5-4 to stay in the match and then broke Wagner again to take a 6-5 lead and have a chance of serving for victory himself.
But Wagner broke once more to make it 6-6 and force a deciding tie-break.
However, the Briton controlled the tie-break, moving 3-2 ahead with a mini-break and then winning the next four points to take the match.
"I thought I could win in two sets and I let my mind wander," Norfolk added. "But you can�t do that against David.
"In the third set I think I focused better but I need to do that for the whole match.
"I'm also pleased with how I played the pressure points, both in the third set and the tie-break and hit the right shots."
Norfolk's victory was also revenge for losing to Wagner in Saturday�s quad doubles final.
Norfolk and fellow Briton Jamie Burdekin lost 6-2 5-7 6-1 to Wagner and Nick Taylor, the top seeds.
Esther Vergeer of the Netherlands and Japan's Shingo Kunieda both successfully retained their women's and men's singles titles.
Vergeer clinched her eighth consecutive British Open crown with a 6-2 6-2 victory over compatriot Korie Homan, the world number two, to extend her unbeaten run in international singles competition to 340 matches.
She then teamed up with Jiske Griffioen to beat Homan and Sharon Walraven 7-6 6-1 in an all-Dutch women's doubles final.
World number one Kunieda proved too strong for Dutchman Robin Ammerlaan, a three-time former champion, winning 6-4 6-2.
Kunieda had earlier suffered defeat in the men's doubles decider when he and partner Satoshi Saida lost 6-0 6-3 to French duo Michael Jeremiasz and Stephane Houdet.
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