Fourth seed Serena Williams defeated eight seed Nicole Vaidisova 6-4 7-6(7) to advance to Moscow semifinals.
Vaidisova difficultly held her serve, especially in the first set when none of her serves went without at least one deuce. However, Williams made only one break despite having, as far as I remember, 9 break points! Vaidisova had one chance to break Serena in the sixth game of the first set, but the American impressively served three aces in a row. In the eighth game of the second set, Williams was broken and trailed 5-3, but she broke back and eventually there was a tiebreak. Vaidisova saved three match points in the tiebreaker before netting a forehand to lose the match.
In the semifinals Serena Williams will face top seed Svetlana Kuznetsova, while Dinara Safina plays against Elena Dementieva.