A beaten semi-finalist last year, second seed Ng progressed by beating Abdallah 13-11, 12-10, 6-11, 11-8 in 63 minutes.

"That was a really tough match," said the 18-year-old from Kuala Lumpur.

"We both had patches where we played fantastic squash and I was just lucky enough to sneak the three games at the end.

"Youssef is a fantastic player, one to watch out for next year for sure."

The men's final will feature both losing semi-finalists from least year after top-seeded Egyptian Saadeldin Abouaish defeated Pakistan's Israr Ahmed 11-5, 5-11, 11-6, 11-1 in 44 minutes.

Abouaish will be looking to quash his reputation as the 'nearly man' after losing the All Africa Junior Championship final and three British Junior Open finals in recent years.

"I'm delighted to end it quickly this time," said the 18-year-old from Cairo.

"I kept my concentration right through. That's one better than last year, and hopefully one more."

The finalists have met four times in the British Junior Open since 2011 with the Malaysian leading the rivalry three wins to one.

"They've grown up together," said Malaysian coach Andrew Cross. "But now it's the big one."

Ng added: "We've had a big rivalry since the British U13s - but there's no bigger stage than the World Junior Final ... may the best player win!"

There was a major upset in the women's event as second seed Hania El Hammamy lost 11-8, 11-4, 11-7 in 46 minutes to fellow Egyptian Rowan Reda Araby.

"I can't believe I'm in the final - and in my first World Juniors," said Araby.

"It was a really tough match," added the 16-year-old.

"I just made sure I concentrated through to the end of the match."

Araby will face firm favourite Nouran Gohar ,the title-holder who is ranked fifth in the world.

In her fourth successive straight games win in a row, the 18-year-old from Cairo brushed aside Malaysian Sivasangari Subramaniam 11-4, 11-6, 11-5.