Results Thursday from the St. Petersburg Open a $63,50AT een o idor ar curs t Peerurks Sors Comlex (seedings in parentheses): Singles Second Round Sergiy Stakhovsky, Ukraine, def. Andrey Kuznetsov, Russia, 6-1, 6-4. Igor Kunitsyn, Russia, def. Michail Elgin, Russia, 6-2, 6-3. Denis Istomin, Uzbekistan, def. Mikhail Youzhny (1), Russia, 6-2, 2-1, retired. 