Federer is a great athelete but he is not the smoothest movers I've seen.
When you say smooth mover, you refere to the cat like mover, Mecir,
Sampras type. They move quiet, light, butter smooth.
"Moves like oil" Sampras. Or Coria "moves like ice cube on the glass plate".
Federer is an astute mover with great court sense. Very dilligent and pretty
smooth. To me, he is somewhat upright and stiff in his upper body
while Sampras gets really low like submarine when he moves.
And when Federer hit his forehand on the run, she shows some awkwardness
in his steps. Breaking with his right foot with some stutter steps near contact
zone. Sampras passes by the contact zone like wind.... shuuu--ing.
"I mean, you have to get emotionally involved. Otherwise, you're doing the wrong thing, you have the wrong job." - Wilander, after French Open 2008