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Boulter grew in confidence on the clay court to beat the crafty Tatjana Maria 1-6 6-3 6-1 and give GB an unassailable lead in the best-of-three tie.

World number four Jessica Pegula mounted a superb second-set comeback to beat Sofia Kenin 6-3 7-5 and land her first clay court title at the Charleston Open.

GB qualified for the knockout stage courtesy of an unlikely win over France on an indoor clay court in Le Portel in April.

The match should have been played on a clay court, but was brought inside because of the weather.

When Zverev broke Jarry to convert his fourth match point, he dropped to his knees on the red clay court, leaned back and let out a scream.