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Russian Marat Safin progressed to the semifinal of the tournament with a straight sets win over Denis Istomin.
Safin bead the Uzbek with the score 6/0 in the first set and 7/6 (7/4) in the second.
Safin, a two-time champion in St Petersburg, will meet qualifier Sergiy Stakhovsky in the last four after he cruised past German Bjorn Phau 6-3 7-5.