Novak Djokovic, who just finished up as runner up at this year's U.S. Open has withdrawn from the Davis Cup's opening singles match. The Davis Cup is scheduled to take place between Serbia and Czech Republic, September 17^th through the 19^th, and is set to hold the World Group Semi-Finals for this year's Davis Cup. It also includes the World Group Semi-finals between France and Argentina as well as some World Group Playoffs between Israel and Australia, Germany and South Africa, Romania and Ecuador and more.

According to sources, Novak Djokovic has pulled out of the Davis Cup opening match between Serbia and Czech Republic citing a case of gastroenteritis, which is commonly known as a stomach flu, and is inflammation of the small intestine and stomach areas. Djokovic recently finished as runner up in the U.S Open by Rafael Nadal, after the match was postponed by rain and then interrupted while it was going on by a thunderstorm. The final score of the U.S. Open's last match at Flushing Meadows was 6-4, 5-7, 6-4, 6-2.

Novak Djokovic has been replaced by Victor Troicki, who is ranked number 47^th in the world, and he is scheduled to play Radek Stepanek today. It is impossible to predict whether or not Djokovic will be playing on Saturday, when the doubles matches are scheduled, or in the reverse singles matching on Sunday. Janko Tipsarevic will play Tomas Berdych from Czech Republic in the 2^nd singles match. Novak Djokovic is ranked number 2^nd in the world right now.