Troicki to play Stepanek after Djokovic withdraws from Davis Cup

Novak Djokovic was forced to withdraw from the opening day of the Davis Cup World Group semi-final between Serbia and Czech Republic on Friday due to stomach problems, a statement said. Victor Troicki, world ranked 47, will replace Djokovic in the first rubber against Czech Radek Stepanek, ranked 35th, a statement on the Davis Cup website said.