I think because Youzhny is better on it and Davydenko despite doing well on clay doesn't adapt well to changing surfaces. I'm guessing also that if the players were asked that they would choose to play on the same surface as the tournaments preceding/following it if they didn't believe any surface would be advantageous.
BILL RAPP: Pete, I wanted to share something with you and with the other folks in the media before we get started. It was a bit of a surprise to me. About two and a half hours ago I was on the phone with Marat Safin's agent from Moscow. Yesterday, while practicing for the Davis Cup tie against Serbia, Marat tweaked his toe and has had an MRI. In a few hours, the Russian team will announce that he will pull out of that Davis Cup tie.
What seems clear is that Djokovic will have to win his three rubbers if Serbia is to triumph. That situation existed before the teams arrived in Moscow, but the stomach virus that afflicted Janko Tipsarevic, the 46th-ranked No. 2 Serb who took Roger Federer to five exhilarating sets in Melbourne 19 days ago, means Serbia go into the opening day with a player who has never played a Davis Cup rubber before, let alone a world No. 4 in his capital city. Tipsarevic is likely to be fit for a fifth rubber, should it be necessary.
Djokovic misses opening day's action
Serbia's star player Novak Djokovic is out of the opening day's action in the Davis Cup by BNP Paribas first round tie in Moscow between Russia and Serbia.
What should have been a triumphant first day in the world group for the Serbian nation has turned into a nightmare, with the withdrawal of both Djokovic and his No. 2 Janko Tipsarevic. It means Serbia must field the doubles specialist Nenad Zimonjic against the world No. 8 Mikhail Youzhny, and the 31-year-old hasn't played a competitive singles match since the last day of April last year.
Djokovic has been suffering from flu-like symptoms all week. The Serbian team had hoped he would recover in time, but they gave up the fight on Friday morning as Djokovic arrived at the Luzhniki Stadium looking pale and tired. Serb officials are still hoping Djokovic will be fit for Saturday's doubles, where he is due to partner Zimonjic.
Tipsarevic has also been fighting off a stomach bug, but he is believed to have picked up another injury in training that is still being assessed, and an official of the Serbian team said he was unlikely to be available to play this weekend.
It leaves the opening day's singles as Mikhail Youzhny (RUS) v Nenad Zimonjic (SRB), followed by Nikolay Davydenko (RUS) v Victor Troicki (SRB).