Where I'm from, there is a common belief that singles players are automatically better tennis players than doubles players. Recently one of my team's singles players, let's say X, got transferred to playing doubles. Personally, I can tell X is unhappy as a doubles player because he is physically very fit thus thinks he should automatically be a singles player as singles is sooo much more physically demanding than doubles. As a doubles specialist, I'm a little irritated by X's ignorant remarks although he has told me before he does not think singles players are better than doubles players. But what he says and does completely contradicts this. So, what do you guys think? Is this true?