Siux Electra ST4 Pro 2025
The Electra ST4 Pro is Franco Stupaczuk’s racket: a hybrid teardrop shape with medium-high balance, designed for advanced players who want to dictate pace and add spin without giving up all-round versatility.
It is a racket for players who want to take the initiative without committing to a full diamond. The hybrid shape keeps a generous sweet spot, the 15K carbon faces give a crisp, connected response, and the medium-high balance adds weight behind the ball when you go on the attack.
Pros & Cons
Pros
- Hybrid shape balances diamond power with round-shape control.
- 15K carbon face and textured surface deliver serious spin bite.
- Shockout anti-vibrators genuinely improve comfort and joint protection.
- Fast and stable at the net for a hybrid.
Cons
- Not as forgiving as a pure round control racket.
- Medium-hard touch isn’t ideal for very sensitive arms.
- Requires clean technique to fully reward you.
On-court performance
Back of the court
The mid-high balance shifts the sweet spot toward the head, helping attacking shots without sacrificing too much manoeuvrability in defence.
From the back, the hybrid shape gives you more margin than a diamond. Defensive lobs and deep balls are easy to repeat, and when a short ball comes, the balance lets you step in and accelerate without changing rackets mentally.
At the net
This is a genuine strength — fast for a hybrid, stable under pressure, with a medium-hard, connected touch.
Volleys feel firm and precise. The 15K faces give a direct, informative touch, so you know exactly where the ball is going, and the head is light enough to react in quick exchanges.
Overheads (bandeja, víbora, smash)
The sandpaper-style surface offers serious bite on aggressive viboras and kick smashes, rewarding players who add spin.
The sand-finish surface is the star overhead. Víboras bite and stay low, kick smashes jump, and flat smashes carry solid pace thanks to the balance. It is not the absolute hardest hitter in Siux’s range, but it combines power and spin better than most hybrids.
Comfort & vibrations
The two integrated Shockout anti-vibrators at the base of the head make a real, noticeable difference to comfort and joint protection.
The touch is medium-firm. Comfort is good for an attacking racket, though players with sensitive arms should still expect more feedback than from a soft round racket.
Spin
The sand-textured 15K faces grip the ball strongly. If you like to cut the ball, slice from the back or add kick to your smash, this is one of the most spin-friendly rackets in its class.
Who it’s for / who should skip it
Good fit if…
- You’re a competitive all-rounder who wants to dictate pace.
- You want a fast, stable hybrid with real attacking edge.
- You like adding spin to viboras and smashes.
Skip it if…
- You want maximum forgiveness above all else.
- You have significant arm sensitivity.
- You prefer a pure round control shape.
Electra ST4 Pro 2025 vs Electra Pro 2026
The ST4 Pro is the 2025 generation of Franco Stupaczuk’s Electra line; the Electra Pro 2026 is its successor and has its own review on PadelCritic. Both share the same idea: a versatile shape for a player who attacks with spin and variety rather than brute force.
If you want the latest generation, go for the 2026 model. If you are happy with a proven racket and can find the ST4 Pro at a lower price, it remains an excellent choice: the core concept of power, spin and control in one frame has not changed.
Specifications
| Shape | Hybrid teardrop |
|---|---|
| Faces | 15K carbon, sand finish |
| Core | Hard EVA |
| Weight | 355–375 g |
| Balance | Medium-high |
| Level | Advanced / competitive |
| Segment | Premium (Stupaczuk signature) |
Note: small unit-to-unit variations in weight and balance are normal.
Alternatives
| Model | Why pick it | Trade-offs |
|---|---|---|
| Siux Diablo Pro 4 2025 | A more forgiving, comfort-oriented hybrid from the same brand. | Less outright attacking edge. |
| NOX AT10 Luxury Genius 12K (2025) | Comparable all-round teardrop control. | Different brand pedigree. |
| Bullpadel Vertex 04 Hybrid 2025 | More overhead power if you want to attack more. | Less forgiving on defence. |
Verdict
The Electra ST4 Pro delivers exactly what a Stupaczuk signature racket should: a fast, stable hybrid that lets you dictate pace and add spin, with genuine comfort thanks to the Shockout system.
For competitive all-rounders who want one racket that attacks confidently without losing all-court versatility, this is one of the more complete hybrids Siux has released.
For advanced players who want one racket that can defend, construct and finish, the ST4 Pro is a very strong all-rounder with a real attacking edge.
In 30 seconds
- Franco Stupaczuk’s hybrid: power, spin and control together.
- Fast and stable at the net; genuinely comfortable.
- A strong pick for competitive all-round players.