Hello! When i searched for a jcf news in google, i came across this article.
Ferrero: The price of change (translated)
Original chinese article here http://www.tennis.com.cn/celeb/20040421/2080.asp
(rough summary of what the article said...)
The article talks about his defeat against Alex Corretja in Monte Carlo. It mentions that JC's playing style has changed - putting more top spin on his ground strokes, meaning he hit many balls out of the court. This new style puts a lot more risk into his game, but didn't threaten Corretja at all. So he made 28 unforced errors in 68 minutes.
The article also mentions JC used to play pretty safely - being patient at the baseline and chase down every ball. This persistance allows for his opponents to get frustrated and hit more errors. But his game has changed, even though in most occasions change is good, but on clay it takes patience. JC isn't a big guy and doesn't have a powerful serve, his strengths are his patience and persistance against his opponents. Now that he lost this attribute, it has become very difficult for him.
The article ended in a positive note, since the alarm bells have already sounded, maybe JC and his coach can review what happened and make more improvements.