Zina Garrison was rather hefty when she was Fed Cup captain. Lendl of course was big. Kafel was big but he lost a lot of the weight. Muster got fat but he got super fit again for his comeback two years ago. Saw Andres Gomez two years ago in Florida and he was definitley out of shape.
"He looked like he was trying to imitate Sampras when I first played him." Agassi in Facing Federer