Williams starts her serve about three feet from the middle of the baseline, which is unusually far. "Some people stand closer, some people stand farther [away]. I stand a little bit farther probably."
This has mostly to do with the types of serves a player favors. Standing farther from the middle of the baseline gives Williams a better angle to attack the body of her opponent. Rafael Nadal, on the other hand, stands close to the middle, which makes it easier to streamline serves up the center of the court.
"A lot of times, it's just comfort," says Williams, who strives for consistency. "You just start it there and you end up there."
She’s says there is never a reason to move – unless you’re taking a shellacking.