In short: a padel ball and a tennis ball look almost identical, but the padel ball is slightly smaller and carries lower internal pressure, so it bounces a bit less and dies faster off the glass. Using tennis balls for padel makes rallies faster and harder to control, and it wears your gear. Buy proper padel balls.
Pick up both balls and you would swear they are the same. Same fuzzy yellow felt, same weight in your palm, roughly the same size. That is exactly why so many beginners grab a tube of tennis balls for a padel session and wonder why the game feels off. The differences are small on paper, but on court they change everything.
The numbers that actually differ
Both balls sit around 56 to 59.4 grams, so weight is not the issue. The gap is in two places: diameter and internal pressure. A tennis ball measures about 6.54 to 6.86 cm across. A padel ball runs a touch smaller, roughly 6.35 to 6.77 cm. More important is the air inside. A padel ball holds noticeably lower pressure, which is why it feels a little softer when you squeeze it and why it stops jumping after it hits the back wall.
Why the bounce matters so much
Padel is a walls game. The ball comes off the back glass, you let it drop, and you play it low. That only works because a padel ball loses energy quickly. A tennis ball, with its higher pressure, rockets off the glass and sits up higher. Rallies get frantic, the classic slow tactical points disappear, and the whole feel of the sport breaks. If you are still learning the rhythm of the walls, this matters even more, which is one reason our guide on what to know before your first padel match keeps coming back to ball control.
Felt, spin and racket wear
Padel felt is thinner with less nap. Tennis felt is thicker, which grips the strings of a tennis racket for topspin. But a padel racket has no strings, just a flat perforated face. Thicker tennis felt drags across that surface and wears it down faster. Over a few sessions you notice a scuffed racket face and a ball that behaves unpredictably.
- Padel balls lose pressure over time, so open a fresh tube for a real match.
- A ball that no longer springs back when squeezed is done, replace it.
- Cold weather drops the pressure further and makes balls feel dead.
- Store tubes sealed until use, the pressurised cap keeps them fresh.
- Rotate three balls in a session so none gets flat before the others.
- Tournament play uses approved balls only, check the brand before you enter.
So can you ever use tennis balls?
For a casual knockabout with kids or a warm-up rally where nobody cares about the score, tennis balls will not hurt anyone. For anything that resembles an actual game, they change the physics enough that you are practising the wrong sport. The lower bounce is baked into the tactics, the same way shape and weight are baked into the racket you pick. If you are still choosing gear, our padel racket buying guide pairs naturally with getting the right ball. For a quick background, the Padel entry on Wikipedia covers the basics.
Grab a tube of proper padel balls before your next session. It costs a few euros and it is the difference between playing padel and playing a confused version of tennis in a glass box.