The U.S. Open champion said on her Web site that she would be available for the matchup in Moscow on April 21-22. Sharapova, who also won the 2004 Wimbledon title, has never played for Russia in the international competition.

``I'm really excited to make my first appearance in Fed Cup for my country and it is great to be playing the tie in Moscow,'' Sharapova said in a statement posted Tuesday on her website. ``Hopefully, myself and the team will put up a strong showing against Spain, who have a good team.''

Russia, which won the Fed Cup in 2004 and '05, lost to eventual finalist Belgium in this year's quarter-finals.