Just wondering what the key technically is to hitting the Federer flat serve 2/3 of the way up the ad court service line? I tend to miss into the doubles alley or get unintended slice on the serve. Also the slider to the deuce court, some people can hit this one halfway up the service line with plenty of swing, I tend to either not get the break, or I get the swing but hit the service line (the one parallel to the baseline not the sideline) 2/3 of the way to the singles sideline. (So nowhere near as short or wide as intended). Also the angled kicker to the ad court. Occasionally I'll land it short and wide and get the intended break, other times it goes into the doubles alley or has unintended slice and goes long. Just after any ideas on how to control spin (and swing) and direction on the serve!? Cheers.