If someone had watched Roger Federer's matches from the 90s, he could witness a completely different player from what he became later. The young Swiss was known for his talent but also a short temper, throwing tantrums on the court and swearing after pretty much every ball he would miss.
Roger used to lose focus after some questionable marks or his wrong moves, arguing with himself and the umpires and making his parents embarrassed a few times. After finishing his junior career in 1998, Federer started to work on that segment and improved it a lot in the next couple of years, becoming a more composed competitor that was entirely concentrated on his game alone.
After one poor decision from the chair umpire at the US Open 2002 against Michael Chang, Roger did lose the rhythm for some time but nothing like he would do in the past, overcoming that and scoring a 6-3, 6-1, 6-3 triumph to book the place in the third round.
"I lost the rhythm for a while in the third set following that terrible call from the umpire; I can't believe he missed that one. I used to show more emotions in the past but lately, there was not much I could show in the last couple of months because I was only losing.
I don't want to just smash racquets; I have a good racquet, there's no need for me to crack that one. It's myself, my head, which was not working. I indeed used to show more emotions when I was younger; I would always have to calm down and save that energy for the match and concentration.
When it's going to be a full stadium, I will show more emotions. Today against Michael, there was no need for that. For me, it's just important that I'm happy on the court and that I smile. Good shots from him, good shots from me, that I enjoy myself. It's essential for my game."