There are youtube videos about Fed playing against Agassi in 2005 AO. Compared his looks then to today. He looks so different now. That time he was only 24, looking like a very energetic thin youngster who are ready go blast, with that hair. These days he looks more mature, more like a gentleman on the court, with much less that kind of energy he had. And the face and body does look slightly more plump. Only 2 years made such a big difference.