Based on what I have heard there is. Because of the natural co-mingling among players word spread about what is the item de jour. The Argentinians are not the only ones cheating. Look at the performance of the Americans on hard courts-a surface that strength and speed works on and compare that to their performance on clay where skill and tennis knowledge is often necessary although Nadal has changed that some what with his transformed physique which no one is allowed to comment too long about. A number of the American players have changed their body shape since coming on the scene but no one has said anything. One Russian player on the ATP sported an oversized head for sometime. It seems to have shrunken somewhat along with his tennis skills. Look at how long these players men and women go in rallies without even bursting a sweat or even looking weary. Players who have not played for months come from out of the blue and with nothing but strength and speed overpower their opponents to reach the finals and semi-finals of events. Cycling is bad but tennis needs close scrutiny. A close up look would perhaps make one shudder. Instead of taking part in petty personality games, tennis journalists should be pursuing something like this and the other bane of the sport-pedophalia.