All four semi-finals across both the men's and women's events went to three games on a thrilling night of squash at the Mall of Arabia.

In the men's singles semi-finals Mostafa Asal continued his fairytale debut run at the tournament by dispatching world champion Tarek Momen, also of Egypt.

Asal, 20, topped a group which featured the world's top two players and the defending champion, and the reigning world junior champion defeated Momen 11-9, 6-11, 11-4.

The 68 minute contest featured scrappy periods of play and some contentious calls before Asal came through the victor in a contest that he described as "really, really tough mentally." 

Asal will face Mohamed ElShorbagy in the final after the fifth seeds overcame New Zealand's Paul Coll.

ElShorbagy triumphed 11-5, 5-11, 11-6 in 49 minutes and will now become the first Egyptian to play in the World Tour Finals title decider on four occasions.

In the women’s singles semi-finals second seed Hania El Hammamy, who progressed through her group without dropping a game, endured a much tougher last four encounter against France’s Camille Serme.

The defending champion won the first game 11-6 before Serme bounced back to win game two in convincing style 11-3.

The deciding game proved a real marathon with El Hammamy coming from game ball down to take it it 14-12, as she triumphed in 54 minutes.

El Hammamy will face compatriot Nouran Gohar in the final tomorrow, with the world number two also taken the distance by New Zealand’s Joelle King.

Gohar won the first game emphatically 11-2, before King edged the second 12-10.

The deciding game went Gohar’s way 11-6 as she wrapped up victory in 46 minutes.