Clay has not previously been Draper's favourite surface but, after receiving a first-round bye, his performance against American Marcos Giron in round two showed promise.

The British number one was not at his best in the opening set against Davidovich Fokina, berating himself with cries of "wake up" and "come on" in an attempt to increase his energy.

That form dragged into the second set, with Draper hitting three double faults on his way to being broken in the opening game.

Trailing by a set and a break, Draper's fortunes changed when he hit an ace to hold serve after saving two break points, raising his arms in relief before playing a fine return game to break back for 3-3.

He saved a match point on the way to forcing a tie-break and ensured a deciding set with a stunning cross-court forehand winner.

The pair traded breaks in a third set of shifting momentum, but Draper struggled to take his chances, converting just two of nine break points while 42nd-ranked Davidovich Fokina converted all three of his opportunities.

Second seed Carlos Alcaraz cruised into the quarter-finals with a 6-3 6-1 victory over 84th-ranked Daniel Altmaier and will meet France's Arthur Fils in the last eight.

Meanwhile, British doubles pair Neal Skupski and Joe Salisbury lost their last-16 match 6-3 6-3 to compatriot Henry Patten and Finnish partner Harri Heliovaara.