The world number 26, who had produced a sublime display to take out the higher-ranked Spaniard Iker Pajares Bernabeu in round one, produced an even better display to defeat France’s Gregoire Marche at the Wimbledon Club. 

Marche, ranked 11th in the world, took the opening game 11-2 but had no answer as Müller then swept past him 11-9, 11-9 and 11-4 to clinch the biggest victory of his career since beating former world number one Karim Abdel Gawad of Egypt to reach the quarter-finals of the 2018 J.P. Morgan Tournament of Champions in New York City.

"I don't know how I won that, I think for the first one-and-a-half games he played at another level, and I had to dig deep to win, that second was crucial to get some confidence to win it," said Müller.

"He’s number 11 in the world, so the pressure was on him.

"I played well yesterday and got some confidence and when I’m confident, I think I’m a dangerous person to play."

Müller is now due to take on Egypt’s world number seven Marwan ElShorbagy for a place in the semi-finals.

ElShorbagy’s opponent tonight, England’s former world number one James Willstrop, pulled out of the fixture due to injury.

Top seed Ali Farag started his title challenge with a 3-0 triumph over fellow Egyptian Mohamed ElSherbini.

Farag, a two-time runner-up at this event, previously known as the Channel VAS Championship, was on fine form, sealing an 11-7, 11-6, 11-7 victory in 32 minutes to set up a quarter-final clash against Welshman Joel Makin.

Makin, the world number eight, got underway with a 3-1 win over Malaysia’s Eain Yow Ng, winning by an 11-7, 8-11, 11-7, 11-3 scoreline in the longest match of the tournament so far at 60 minutes.

An injury will also cut tomorrow’s second-round fixtures short, with India’s Saurav Ghosal withdrawing from his match against Egypt’s Mazen Hesham, meaning there will be just three matches in store at the Wimbledon Club.