Genie's service, in particular, didn't get so much attention yet, but despite some improvement possibilities concerning mainly the increase of its margin, it has a lot of good aspects, mainly around the body energy integration into the stroke. Genie mostly gains quite high percentages out of her serving points.
With his 1st service, Frances could have quite a potential weapon at his disposal (after all his fastest service during the 2016 US.Open was clocked at 142 mph, same like the fastest service from John Isner), but small details are in my opinion often taking a bit away from its potential. The main issue is for me in the rather suboptimal integration of the body energy into the stroke in the moment of impact at most of Frances' services.
Tall Garbine (182 cm / 6'0'') can consider her serve as one of her weapons. The photos from her practice during the 2015 US.Open show that Garbine well fulfills the requirements of the Service 3.0.
Here the distinction between her typical first service (usually more or less direct with just a slight topspin) and her famous kick service (heavy topspin with some sidespin used mostly as a second service) are quite visible. In both varieties, Samantha spends almost the entire stroke energy on the dominant (right, in her case as a right-handed player) side. The "follow through 1" (= the active part of the follow through) of the kick/topspin serve then goes, besides other differences to the first service, much more to the right.
Ivo Karlovic (*1979 / CRO) belongs to the most dominant servers/servicemen in the history of tennis and his more than 11,500 aces served throughout his professional career (as of December 2016) on the tour are a record hardly to be matched. At the height of 211 cm (6’11”) and weight of 104 kg (230 lb), Ivo...
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....
Ying-Ying Duan (*89 / CHN) can be at her age of 27 years hardly considered as a young tennis prodigy, but this relatively new entrant into the WTA top 100 could eventually become a factor in the women's tennis. At her height of 186cm (6'1''), the service can be considered as her biggest weapon. Her service surely has already quite some potential, but certain improvements could bring even better serving efficiency and higher margin along.
Rebeka Masarova (*1999 / SUI) with her WTA ranking of #314 (as of July 18, 2016) is currently the world highest ranked player before reaching the 17th birthday. Rebeka, who won the 2016 French Open junior event a few weeks ago, considers service as her favorite stroke. She has Slovak and Spanish roots and is currently being coached by her mother. As all very successful Swiss female tennis players of the past over 20 years, Rebeka was developed largely privately outside of the regular Swiss Tennis Association program!
In my personal opinion, Sloane's main "road block" is in just mediocre TENNIS 3.0 benchmark fulfilment in most of her strokes, which could be based partly on limited knowledge of and partly on missing readiness to apply the TENNIS 3.0 CODE within the "3 Step Tennis Stroke Regulation" as often and as precise as possible.
Forehand lasso/reverse finish of Rafael Nadal (*1986 / ESP) is not always exactly what many think that it might be. Surely, Nadal as many other players (notably Sampras, Sharapova) goes with his racket very fast and steep up and later back when he is hitting an emergency forehand with limited time/space availability (close to the body)....
