Nadal Still Doubtful

Big-serving John Isner wants to see a fully fit Rafael Nadal against him in next month's Davis Cup semi-finals, though the Spaniard is still unsure if he will recover from a nagging knee injury in time to feature against the United States.

The world number three, after a shock second-round Wimbledon defeat to Czech Lukas Rosol in June, has not played yet.

He missed the opportunity to defend his Olympic Gold at London, and was also forced to withdraw from the US Open.

Asked if he would be fit for the September 14-16 Davis Cup tie in Gijon, Nadal said, "I don't know".

"The truth is I really don't have any idea and when the time comes my knee will decide, and if the knee is fine, then the captain will decide," the 26-year-old said.

"I am feeling the calm that comes from knowing I'll be back when I genuinely feel ready to play at the level I really want to and not have to suffer through every match," Nadal told on the sidelines of Wednesday's Super Cup match between Real Madrid and Barcelona.

But Isner is keen to face Nadal.

The world number 10 said, "I'm not going to sit here and say that I don't want him to play. Everyone wants him to be healthy. Honestly, if it was up to me, I would want him to play. I would want Spain to send out their absolute best team,"

"Obviously Rafa on clay, he would make that team pretty tough. But if he doesn't get to play, the match is still going to be so tough.

"It's Spain. They're the best tennis country in the world. I would imagine they would throw David Ferrer and Nicolas Almagro at us, if I had to guess, two guys that know what they're doing on clay.

"I don't feel like it gets that much easier, even if Rafa doesn't play. If he does happen to play this tie, I know our team is going to go in there believing we can win."

Meanwhile Nadal will be paid $1.5 million for a two-hour show at an exhibition tennis match at Madison Square Garden, where he is supposed to play.

If everything goes well the eleven time Grand Slam winner will meet 2009 U.S. Open champion Juan Martin del Potro at the March 4 event.

The Olympics and Wimbledon champion Serena Williams will face top- ranked Victoria Azarenka in the first match of the sixth annual event that was billed this time as BNP Paribas Showdown.