The 17th seeds denied the seventh seeds a place in the last 12 of the biennial event for the first time since 1984 with their victory in the Polish city of Bielsko-Biała.

South Africa, who finished in 17th place two years ago, took the lead in the final tie in Pool F when Richard-John Kuhn beat Ong Sai Hung 5-11, 11-8, 11-5, 6-11, 11-7.

But it was the country's unranked second string player Callan Mackenzie Hall who ensured South Africa's place in the top 12 for the first time since 2006, when he dispatched Malaysia's Mohd Farez Izwan 11-8, 11-9, 11-7 in 37 minutes.

South Africa will now face Australia for a place in the quarter-finals after the 10th seeds beat Guatemala 2-1 to finish in second place in Pool C.

There was a brief scare for Australia however, as Alex Eustace lost to Guatemala's Junior Enríquez Franco 10-12, 9-11, 6-11 in the first match of the tie before Joseph White beat Ricardo Toscano and William Curtis saw off Roberto Urruela Bowen to secure their place in the next round.

Favourites, and defending champions, Egypt are looking to become the first nation in the event's 36-year history to win the title four times in a row.

In this week's singles competition, Eain Yow Ng became the first Malaysian for seven years to secure the World Junior Squash Championships title while Nouran Gohar of Egypt successfully defended her women’s crown.

Ng beat top seeded player Saadeldin Abouaish of Egypt 11-3, 9-11, 11-7, 11-5 in 54 minutes, whilst Gohar breezed to a straight games triumph over team-mate Rowan Reda Araby to complete the tournament with a flawless record.