Sobhy came from two games behind to defeat El Tayeb 3-2 on home soil in round three of the PSA World Tour Platinum tournament, held at Philadelphia's Drexel University.

The American has been sidelined by an Achilles injury but showed a return to form to defeat the 2017 champion, 9-11, 8-11, 12-10, 11-6, 11-6.

Sobhy will now take on France's Camille Serme in the quarter-final, who beat Hong Kong's Annie Au 3-0, 11-6, 11-8, 11-6.

"It's a special win for me," said Sobhy.

"I was thinking about this match since the summer.

"I know how good she is and she won it last year, but I wanted to prove to myself that I could do it. 

"I narrowly lost to her in five at the British [Open] and I knew that I'm right there with the top three still, but I just need to break through and I'm so pleased with how I fought back today, and having my whole support team here is huge for me and a big confidence booster."

World number one Nour El Sherbini of Egypt is also still in the competition after defeating England's Alison Waters 3-0, 11-6, 11-8, 11-8.

The world number one in the men's tournament, Egypt's Mohammed Elshorbagy, has progressed to the quarter-finals after a 3-0 victory over India's Saurav Ghosal.

"With Saurav it’s always a tough match," Elshorbagy said after his 11-5, 16-14, 11-9 victory.

"Our matches are always very tight and very difficult. 

"He always knows how to move me around the court, so I knew from the first point that I had to be sharp and on my toes and I'm really happy with how I won that crucial second game. 

"In the third game he made a comeback and I'm just glad that I closed it out in the end."

Elshorbagy will now play compatriot Mohamed Abouelghar after he beat fellow Egyptian Karim Abdel Gawad 3-0, 11-8, 11-9, 12-10.

The second half of the PSA US Open third round games will be played tomorrow, featuring the men's defending champion Ali Farag of Egypt against Welshman Joel Makin.