What Is String Tension and Why Does It Actually Matter?

Most players never change their string tension from the default. That's a mistake. Here's what tension actually does to your game — and how to find the right number for you.

Most rackets come from the factory strung somewhere between 55 and 60 pounds. Most players never question it. That's a mistake, because string tension is one of the few things you can actually control about your racket — and it has a bigger effect on your game than most people realize.

What tension actually does

Here's the counterintuitive part: higher tension does not mean more power. It means less. A tighter string bed deflects less when it contacts the ball, which means less energy is stored and returned. Higher tension gives you more control — the ball goes where you aim it — but you have to generate all the power yourself.

Lower tension does the opposite. The strings deflect more, store more energy, and return it to the ball. You get more power and a larger effective sweet spot, but the trade-off is less precise control over direction.

What the pros actually do

Jannik Sinner, the world number one, strings his Head Speed Pro at 61 pounds. That's on the high end — he generates enormous racket head speed and needs the control. Carlos Alcaraz strings closer to 55 pounds, prioritizing feel and comfort.

The average ATP player strings between 48 and 57 pounds. The average recreational player strings between 55 and 65. Most club players are stringing tighter than the pros — which usually means they're sacrificing power and comfort without gaining much in return.

Tension and arm health

This is worth taking seriously. Higher tension means more shock transmitted to your arm on every shot. If you've ever dealt with tennis elbow or wrist pain, dropping your tension by 5 to 10 pounds is one of the first things worth trying. It costs nothing and the effect is immediate.

How to find your number

Start with the midpoint of your racket's recommended tension range — usually printed on the frame. If you want more power or comfort, go 3 to 5 pounds lower. If you want more control and are already generating plenty of pace, go 3 to 5 pounds higher. Most players find their sweet spot after two or three restrings.

The right tension is the one that lets you play your best tennis without thinking about it.