Unranked United States player Marina Stefanoni caused the biggest upset on day three of the World Junior Individual Championships after the 14-year-old scalped World No.37 Nada Abbas at the Devoy Squash & Fitness Centre in Tauranga, New Zealand.
Abbas burst onto the scene last season after shocking World No.5 Nouran Gohar at the British Open, but the 17-year-old from Giza was on the wrong end of an upset in Tauranga, with Stefanoni prevailing by an 12-10, 7-11, 11-7, 11-9 scoreline.
“I'd never played her before, but I watched her play yesterday and saw how her opponent was winning points so I tried to replicate that,” said Stefanoni.
“I started well but she fought back and I had to try to catch up again.
“At 6-1 in the fourth I lost a bit of focus, thinking it would be pretty cool to be in the quarters, but at 7-6 down I knew I had to get back to my game.
“It feels great to be in the quarters, [I'm] really excited about that.”
Stefanoni now plays 5/8 seed Satomi Watanabe – who won the PSA Women's Player of the Month in May – for a place in the last four
An Egyptian semi-finalist is assured at the bottom of the draw where Amina Yousry and Zeina Mickawy meet in the quarter-finals. 5/8 seed Yousry beat Hong Kong's Lui Hiu Lam 11-2, 4-11, 11-8, 11-2, while second seed Mickawy defeated Malaysian Aifa Azman 12-10, 13-11, 11-7.
Egypt will have four quarter-finalists in the Men's event for the first time in seven years after Mostafa Asal and Aly Hussein upset Kyle Finch and Adhitya Raghavan, respectively.
Second seed Mohammad Alsarraj awaits Asal in the quarter-finals after he ended the run of Colombia's Matias Knudsen.
“That was close, he plays proper squash and made me work hard,” said World No.89 Alsarraj.
“I didn't play my best, but I needed that level of intensity to get properly into the tournament and to get used to the court. I'll be ready tomorrow.”
Meanwhile, Hussein is the only unseeded player to reach the last eight and he will take on Frenchman Victor Crouin.
Results – Fourth Round: 2017 Men’s World Junior Individual Championships
 Youssef Ibrahim (EGY) bt [9/16] Ong Sai Hung (MAS) 9-11, 16-14, 14-16, 11-7, 11-5 (66m)
[5/8] Andrew Douglas (USA) bt [9/16] Tom Walsh (ENG) 11-4, 11-9, 11-6 (36m)
[5/8] Abhay Singh (IND) bt [9/16] Mohamed Elshamy (EGY) 10-12, 11-7, 13-11, 11-8 (38m)
¾ Marwan Tarek (EGY) bt [9/16] Adam Corcoran (ENG) 11-5, 11-6, 14-12 (38m)
¾ Victor Crouin (FRA) bt [9/16] Darren Rahul Pragasam (MAS) 11-6, 11-6, 11-0 (27m)
Aly Hussein (EGY) bt [5/8] Adhitya Raghavan (IND) 11-3, 8-11, 11-7, 4-11, 11-3 (47m)
[9/16] Mostafa Asal (EGY) bt [5/8] Kyle Finch (ENG) 11-9, 11-7, 11-7 (43m)
 Mohammad Alsarraj (JOR) bt Matias Knudsen (COL) 11-7, 9-11, 11-8, 12-10 (35m)
Draw – Quarter-Finals
 Youssef Ibrahim (EGY) v [5/8] Andrew Douglas (USA)
¾ Marwan Tarek (EGY) v [5/8] Abhay Singh (IND)
¾ Victor Crouin (FRA) v Aly Hussein (EGY)
 Mohammad Alsarraj (JOR) v [9/16] Mostafa Asal (EGY)
Results – Fourth Round: 2017 Women’s World Junior Individual Championships
 Hania El Hammamy (EGY) bt [9/16] Chan Yiwen (MAS) 11-3, 11-5, 11-4 (22m)
[5/8] Sivasangari Subramaniam (MAS) bt [9/16] Zoe Foo Yuk Han (MAS) 11-5, 11-6, 11-9 (22m)
[5/8] Satomi Watanabe (JPN) bt [9/16] Lucy Turmel (ENG) 11-8, 11-4, 11-6 (28m)
[9/16] Marina Stefanoni (USA) bt ¾ Nada Abbas (EGY) 12-10, 7-11, 11-7, 11-9 (41m)
¾ Rowan Reda Araby (EGY) bt Jana Shiha (EGY) 12-10, 11-5, 11-3 (24m)
[5/8] Andrea Lee (MAS) bt [9/16] Elise Lazarus (ENG) 11-9, 11-8, 11-8 (28m)
[5/8] Amina Yousry (EGY) bt [9/16] Lui Hiu Lam (HKG) 11-2, 4-11, 11-8, 11-2 (28m)
 Zeina Mickawy (EGY) bt [9/16] Aifa Azman (MAS) 12-10, 13-11, 11-7 (25m)
Draw – Quarter-Finals
 Hania El Hammamy (EGY) v [5/8] Sivasangari Subramaniam (MAS)
[9/16] Marina Stefanoni (USA) v [5/8] Satomi Watanabe (JPN)
¾ Rowan Reda Araby (EGY) v [5/8] Andrea Lee (MAS)
 Zeina Mickawy (EGY) v [5/8] Amina Yousry (EGY)