Playing the game in the last days i´ve notice than at the start of every season the stats of all the players increase/decrease depending on how good is that year for the player in real life.
The thing is, sometimes happens that "unknown" players at the time becomes REAL good, and end up apearing way before they did in reality. For example, in 2005 Rafael Nadal becomes REAL good and end up wining Australia for sure, when he truly appear a few months later in Roland Garros. The same happens to Roger Federer in 2003.
Its not a big deal, and doesn´t ruin the game at all, but its something curious that I wanted you to notice.