Poisoning not Noro?

ESPN reports that The International Tennis Federation is investigating allegations that 13th ranked, US Open quarter finalist Tommy Haas was poisoned before Germany’s Davis Cup match against Russia.

The report says that Haas was forced out of a match with what appeared to be a stomach virus (sounds like noro?) on September 23.  Germany’s opponent Russia went on to win the semifinal series and reach the Davis Cup final.

German teammate Alexander Waske said he was told by a Russian who manages numerous athletes that it was poisoning, not a virus.

Haas was quoted as saying "I was the only one ever to order dessert or a Latte macchiato after dinner. If all this is true, since no one else got sick, that must have been when it happened."