World number two tennis player Rafael Nadal of Spain has extended his advantage over top-ranked Roger Federer of Switzerland, beating him in a doubles match at the Rome Masters tournament in Italy.

Nadal and fellow Spaniard Carlos Moya teamed up to beat Federer and his Davis Cup teammate Stanislas Wawrinka, 6-4, 7-6 in Monday's opening round doubles match.

It was just the second time Nadal has faced Federer in doubles. The young Spaniard was also victorious the first time, teaming with countryman Tommy Robredo to beat Federer and Yves Allegro during the Indian Wells, California, tournament in 2004.

In addition, Nadal has been dominant in singles, beating Federer in seven of their 10 matches, including all five on clay courts.

The two star players normally play only singles, and Federer said he entered doubles at this tournament to help his friend Wawrinka who has been coming back from an injury.

Some information for this report was provided by AP and Reuters.