Roger's service has more pronounced pronation and he spends a higher percentage of the service energy on the dominant (=right) side of the body than Andy. Over his entire career on the tour (data until mid-January 2017), Federer has the 1st service percentage of 62% (Murray 58%, Djokovic 65%, Nadal 69%) on which he won 77% of the points (Murray 75%, Djokovic 73%, Nadal 72%)...
Naomi correctly fulfills all the essential Service 3.0 (of Tennis 3.0) requirements. Certain distinct improvements bringing higher margin and better efficiency would be still possible though. Some of the main aspects to work on are mainly around the rather arm-power forced pronation, which is quite normal when proper pronation was introduced to the player later in the career but should still become a bit more fluid (with better contraction-relaxation coordination) over the time to make an optimal....
One of the most misleading tennis instructions is the imperative suggestion to lead the racket after the impact across to the non-dominant leg (left with the right-handed player) in the follow through of the service motion....
