Alister Walker, the former Englishman making his first PSA World Tour appearance for his country of birth, cast aside Colombian teenager Andres Felipe de Frutos to reach the quarter-finals of the Colombian Open, the PSA International 35 event at Club El Nogal in Bogota.

Wildcard player De Frutos was making his Tour debut - and, aged just 17, was the youngest player ever to compete in the long-established Colombian Open.

But third seed Walker, the former England international now flying the flag for Botswana, needed just 22 minutes to overcome the rising Colombian star 11-3, 11-3, 11-7.

New York-based Walker, ranked 21 in the world, will now face Martin Knight for a place in the semi-finals. Knight, the world No46 from New Zealand, battled for 69 minutes to overcome Australian qualifier Matthew Karwalski 12-10, 6-11, 11-9, 11-1.

Miguel Angel Rodriguez led local interest into the last eight after beating Mexican Cesar Salazar 11-6, 8-11, 12-10, 11-2 in 56 minutes. The No4 seed from Bogota, returning from the injury which ruled him out of last week's world team championship in Germany, will now line up against Rafael Alarcon.

The top-ranked Brazilian brushed aside Gonzalo Miranda, a qualifier from Argentina, 11-7, 11-4, 11-4 in 22 minutes.

Top seeds Mohamed El Shorbagy and Laurens Jan Anjema secured their quarter-final berths in contrasting styles. Egyptian El Shorbagy, the 20-year-old event favourite, defeated Mexican Arturo Salazar 12-10, 11-4, 11-8, while second-seeded Dutchman Laurens Jan Anjema needed four games to see off Czech champion Jan Koukal 11-2, 7-11, 11-3, 11-3.

RESULTS: PSA International 35 Colombian Open, Bogota, Colombia

1st round:
[1] Mohamed El Shorbagy (EGY) bt Arturo Salazar (MEX) 12-10, 11-4, 11-8 (40m)
Max Lee (HKG) bt [Q] Eric Galvez (MEX) 11-9, 16-14, 12-10 (56m)
Martin Knight (NZL) bt [Q] Matthew Karwalski (AUS) 12-10, 6-11, 11-9, 11-1 (69m)
[3] Alister Walker (BOT) bt Andres Felipe de Frutos (COL) 11-3, 11-3, 11-7 (22m)
[4] Miguel Angel Rodriguez (COL) bt Cesar Salazar (MEX) 11-6, 8-11, 12-10, 11-2 (56m)
Rafael Alarcon (BRA) bt [Q] Gonzalo Miranda (ARG) 11-7, 11-4, 11-4 (22m)
Henrik Mustonen (FIN) bt [Q] Erik Tepos Valtierra (MEX) 14-12, 11-3, 11-9 (39m)
[2] Laurens Jan Anjema (NED) bt Jan Koukal (CZE) 11-2, 7-11, 11-3, 11-3 (47m)

Quarter-final line-up:
[1] Mohamed El Shorbagy (EGY) v Max Lee (HKG)
[3] Alister Walker (BOT) v Martin Knight (NZL)
[4] Miguel Angel Rodriguez (COL) v Rafael Alarcon (BRA)
[2] Laurens Jan Anjema (NED) v Henrik Mustonen (FIN)