For many years you were exactly right, although we have found in history where they have come very close to cracking the code on this.
Historically this has been a very misunderstood topic and if it was presented clearly by the commentators, Chas here would definitely have a tight grip on it. He studies the issues and knows well what is reported on a topic of his interest by those he considers experts.
So No, I don't think the TV commentators are the ones who know. They may see players are hitting strongly through the court more and doing a better job of it, but they struggle with how to represent whats happening and defer mainly to the result. They often struggle to find the words to describe the processes of what they see since these details have not been described to a very high resolution.
I expect there are many lenses people can use to view the world to a varying accuracy, but the key is developing one that works well for you consistently. Tennis is no different. I have developed categories that I find very helpful on this and many other topics of how to strike the ball and swing a racket. I will share some of it here.
The confusion starts in the initial premise...."the commentators were mentioning the increasing importance of hitting through the court vs top spin drives".
Hitting thru the court IS A TOPSpin Drive...these are the same thing!
.....the physics of the game just don't allow hardly any strong shots thru the court without having an element of Topspin, and "hitting thru the court" requires it to be a strongly Driven ball. Despite the rare exceptions, given that we need to have topspin to execute well when we drive powerful shots thru the court, lets realize that it is the Topspin Drive that is hit "thru the court" with a flatter trajectory and aggression. That can also be backed up with historical reference if you like.
So what is this other shot they are calling the Topspin Drive?
In the vertical realm we only have 2 basic choices. The ball is hit on a near flat trajectory or it is hit with more of a arc / curve something like a rainbow, going up a bit and then using a blend of gravity & topspin to bring it back down again. Even rainbows vary in how their arc curves and it is the same in tennis. Some strong hitters really blur the lines between flatter drives and the arcs that I call "lift and spins". Now lift and spin may strike you as some "high, soft, rolling shot" with no zip on it, but most often, that is not at all the case at all. The terms are clear Imo. It means they are lifted to some extent, in order to start the arc (vs a flatter shot trajectory) and they have a bigger emphasis on spin than a flatter trajectory TS drive. The name "Lift and spin" denotes the 2 main properties the player should aware of....How much lift and spin is up to the hitter and what they can execute with consistently. I will say that to overly minimize the arc is the biggest groundstroke error I see in the Pro game. Not accounting for the arc well, results in both the long ball & the ones into the net, which are most often caused by not swinging to account properly for shaping the best arc for the player's range of shots.
The Lift and Spin can be either a Fade or a draw spin, but with each, the spin is closer to the 12 O'clock and should be about 11 or 1 on the clock face as a guide. On the other hand, the TS Drive, Hitting thru the court, or Power Fade as I call it, should normally be hit with Fade spin that some may relate to a screwball in baseball. The spin can be significant but should be closer to sidespin than the "over the top" normal topspin. It should have an aspect of TS and not a pure sidespin though.... 20-40 degrees spin above level can still help the ball come down significantly. By creating a swing path in this more horizontal plane, it allows for a much flatter shot that is lower on net clearance. THis Lower, flatter trajectory along with a less dipping TS will help the ball to stay down better after the bounce and get thru the court much quicker. Using this shot is a significant part of hitting "on the rise" due to the more horizontal swing path matching up so well with the path of the "rising ball".
So from the perspective I have developed, this comes down to understanding the types of topspin at your disposal and the types of technique differences that make them work well (which I didn't cover here).
Hitting thru the court is about driving a TS Shot on a flatter trajectory with a more horizontal swing plane, that also should normally elicit a Fade Topspin that is closer that horizontal plane. Using the more standard "over the top type topspin" is more about lifting and spinning the ball in a wide range of arc types from close to flat, all the way up to topspin lobs. Depending on the contact height and shot shape intent, these shots may use the Fade or the Draw type spins that are each much closer to the traditional 12 o'clock area.
The third and most specialized ability needed to complete the Shot Matching Cycle is to understand the “Fade vs Draw” spins
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