The ninety eight inch racquet head won the argument years ago

Racquet head sizes converged on a narrow band and stayed there, which tells you something about what actually helps a player.

Look along a rack of professional level frames and the headsizes have collapsed into a band. Ninety five to one hundred square inches, with the great mass of them at ninety seven or ninety eight. That convergence happened without any rule forcing it, across competing manufacturers with every commercial reason to differentiate, which makes it the closest thing tennis equipment has to an experimental result.

The old mid size at eighty five had a genuine argument behind it. A smaller hoop means shorter strings, a stiffer string bed, more control on a clean strike, and less deviation on a mishit because the mishit is further off centre and the frame is narrower. Players who found the middle every time loved them. Everybody else found them unforgiving in a way that is difficult to describe to anyone who never held one.

Oversize frames at a hundred and ten went the other way. Long strings, a trampoline effect, enormous power on a soft swing, and a string bed that flexes so much on hard hitting that precision goes out of the window entirely. Wonderful for a player with a short compact swing and shoulder trouble. Unusable at speed.

What settled the argument was polyester string. Once the string bed itself could grip and spin the ball, players started swinging faster and hitting with far more topspin, and topspin is what brings a fast ball down inside the baseline. The frame no longer had to supply control through a tight small head, because spin supplied it. So the head could grow a little for forgiveness and stability without giving up accuracy. Ninety eight is that compromise, and it has held for two decades.

Here is where I think the market misleads people anyway. Club players are routinely steered toward a hundred and five or larger on the theory that they need help, and I would argue most of them need stability far more than they need power. A big head on a light frame twists on contact and gets pushed around by a heavy incoming ball, and the resulting error looks like a lack of strength when it is really a lack of mass.

The pros converged on the boring middle. There is usually a reason the professionals converge.

I would take a heavier ninety eight over a light hundred and five for almost every adult I have coached, and I know exactly how that sounds in a shop.