Nadal out of Spain's Davis Cup semi-final

Spain will be without Rafael Nadal for its Davis Cup semi-final against France in Lille.

Spain to go without Rafael Nadal for its Davis Cup semi-final against France.   -  Getty Images

Rafael Nadal will miss Spain's Davis Cup semi-final against France due to a knee injury.

Nadal retired while trailing his US Open last-four clash with Juan Martin del Potro by two sets to love on Friday, citing pain in his right knee.

The 17-time grand slam champion confirmed he would miss Spain's trip to Lille for their Davis Cup tie beginning on September 14.

READ: Nadal: Knee pain meant I had to retire in semifinal

"Hello everyone, on the way home, in addition to having missed the opportunity to play a grand slam final here in New York, you will know that I finally cannot play Davis Cup this weekend in Lille against France," Nadal wrote on Twitter on Saturday.

"I had made a good schedule thinking about my goals, including the Davis Cup, one of the reasons for not playing Cincinnati [in August].

"Very sad to not be able to try to help the team play the final."

Spain captain Sergi Bruguera confirmed Albert Ramos had been called up as Nadal's replacement.