the pros win every point because placement doesn't play a role when the difference in skill is too high. even when the ball is directly hit at the 4.5s they still couldn't handle the pro ball because it is too hard and heavy. and on top of that they wouldn't even get into the points as they couldn't handle their serves and returns.
below 5.0 the better singles players will nearly always win a double because ability to hit and tolerate shots of the opponent trumps tactics.
only at the higher levels strategy starts to play a bigger role.