I'm not surprised at all. It's tough to expect that 30-year-old Pics will be beating on North American hardcourts players with similar ease to his wins over guys on South American claycourts.
In the bit I saw, Istomin was confident in his defensive abilities- able to outrun and breakdown Ferrer of all people. Ferru may have been ill, but Istomin is looking stronger and stronger lately.
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