Unseeded South African Wayne Ferreira has continued his giant killing run at the Australian Open by upsetting fourth seed Juan Carlos Ferrero 7-6 7-6 6-1, reaching his first grand slam semi-final in 11 years.

The 31-year-old, who also reached the last four in Melbourne in 1992, took the first set tiebreak 7-4, and Ferreira twice fought back from a break down to force another tiebreak in the second set at Rod Laver Arena.

Ferreira took the second on his third set point after which it was one-way traffic as Ferrero's game fell to pieces.

The Spaniard lost the first four games of the third set and Ferreira ran out an easy winner in two hours, 11 minutes.

He next faces second seed Andre Agassi in the semi-finals.

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