At the very top of tennis, when fine margins can make the difference between conquering the court and leaving it empty handed, everything makes a difference - from the perfectly strong racket to managing the mental side of your game.
And for athletes on the wheelchair tennis circuit, this also means having the right set of wheels, because you could have the backhand of this guy, but if you haven't mastered the movement of your chair, you won't even get off the baseline.
We present Exhibit A. Novak Djokovich playing Dylan Alcott at a special event ahead of the 2017 Australian Open.
More personalized than Federer's footwear, but with a much higher price tag, which runs into the thousands, a well-fitting chair assessed and measured to fit an individual size and classification will mean it responds to every movement from the player, improving court coverage, speed and shot power, and reducing the risk of injury in the process.
We probed the mechanical minds at RG K who make the Grand Slam chair, a game changer when it was launched due to the addition of the knee brace, which enabled the individuals to be fully locked in and aided for better performance.
It is also one of the chairs you see a number of the elite players competing with on tour, including Jordanne Whiley, Gordon Reid, and Alfie Hewett.
And these are RG K's top five things to consider when fitting a chair at elite level.
Number one, the center of gravity measurement.
That's basically the wheel position to help determine the spin on the chair.
Number two, height, getting this right is important.
