Gulbis stuns Del Potro to progress to Farmers Classic semis

Talented Latvian Ernests Gulbis caused a major shock as he beat second seed Juan Martin Del Potro 6-2 6-4 to reach the semi-finals of the Farmers Classic.

It was his first win in three meetings with the Argentinian, who struggled to make an impact on his opponent's serve.

Next up for Gulbis is Alex Bogomolov Jr, who beat fourth seed Thomaz Bellucci 1-6 6-4 6-1 to reach his first ATP Tour semi-final.

The other semi will be an all-American affair between the top seed Mardy Fish, who beat Igor Kunitsyn 6-2 6-4, and Ryan Harrison, a 3-6 6-3 6-4 winner over Lu Yen-hsun.