Claro Open Colombia: Ivo Karlovic stuns Igor Sijsling
Ivo Karlovic caused an upset as he knocked third seed Igor Sijsling out of the Claro Open Colombia in Bogota.
Last Updated: 18/07/13 7:08am
Karlovic's powerful serve provided the platform for a 6-3 7-6 (16-14) victory - with the Croatian winning 84% of points on his first delivery.
Karlovic will now face Adrian Mannarino in the quarter-final, with the fifth seed having brushed aside Victor Estrella Burgos with ease.
The Frenchman, who reached the fourth round at Wimbledon, registered a 6-1 6-2 win in just 63 minutes.
Second-seeded Kevin Anderson hit 18 aces as he overcame qualifier Emilio Gomez 6-3 7-6 (7/2).
Anderson will now take on home hope Santiago Giraldo after the No 6 seed bounced back to beat Chris Guccione 3-6 6-3 6-4.
Australian qualifier Guccione must have thought he was on course for a shock win however Giraldo rallied in impressive fashion.