Both won semifinal matches Saturday.
Verdasco posted a 6-1, 6-3 victory over Fabio Fognini, who upset five-time Umag champion Carlos Moya of Spain in the quarterfinals Friday.
Andreev, who was last week's Gstaad runner-up, beat Argentine Maximo Gonzalez 6-2, 7-6 (7-2).
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