In the other quarter final matches, fifth-seeded slugger Fernando Gonzalez of Chile ousted second-seeded David Nalbandian of Argentina, 3-6, 6-3, 6-1, while Slovakia's Dominik Hrbaty beat Austrian native and crowd favorite, Stefan Koubek, 6-1, 5-7, 6-2.
In Saturday's semis, Ljubicic will meet Hrbaty and Roddick faces Gonzalez. The winner of the tournament on Sunday will receive a first prize check of $137,000.
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