Former world No. 1 Juan Carlos Ferrero of Spain rallied to defeat fifth-seeded Argentine Guillermo Canas 3-6, 6-3, 7-6 (7-5). Ferrero reached the Vienna final in 2005, while Canas was the runner-up here in 2001 and 2004.
In other matches, former Top 10 star David Nalbandian of Argentina posted a 6-3, 7-6 (7-3) victory over Italian Stefano Galvani; American Mardy Fish beat Spaniard Nicolas Almagro 6-7 (4-7), 6-2, 6-4; and Austrian Jurgen Melzer dispatched countryman Alexander Peya 6-4, 6-3.
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