After the U.S. Davis Cup team’s recent loss to the Russians on the slow red clay court in Moscow, there will be the inevitable discussions about how Americans need to learn to play on clay.  Sure, it’s true that Americans need to master the red dirt better or they will never win a title at Roland Garros.  But clay was not the cause of America’s defeat in Russia.  Andy Roddick and James Blake did not lose to clay court specialists.  They lost to Marat Safin, Mikhail Youzhny and Dmitry Tursunov.  Safin, who won his two Grand Slam titles on the hard courts in Melbourne and New York, has never done that well at Roland Garros.  Youzhny has one title on clay and may be more naturally comfortable on the surface than James Blake, but Youzhny is not a clay court specialist.  Although Dmitry Tursunov is playing for the Russian Davis Cup team, he’s lived in the U.S. since he was twelve.  Tursunov grew up playing on California hard courts and calls fast surfaces his favorite!  James Blake and Andy Roddick played valiantly and fought hard, but they just didn’t come through on the big points when it really mattered.  For example, Andy Roddick served for the match at 6-5 in the fifth set against Tursunov and lost the game quickly on his own unforced errors and poor serving.  It was what was going on in their heads rather than what was under their feet that caused the Americans to lose…