20-time Major champion Roger Federer has been a role model for many tennis players over the last 15 years. Like all other competitors, Federer has had some dark moments in those most difficult moments over the years. Still, he is usually calm and collected on the court, concentrating on tennis and the opponent on the other side of the net.However, this was not always the case, as it would be difficult to recognize Roger from his behavior in his late teens. The Swiss couldn’t contain his temper from the first junior competition matches, throwing rackets and having something to say about ever …