Siux Electra ST4 RL 2026 Franco Stupaczuk

Siux Electra ST4 RL 2026 Franco Stupaczuk is an attack-minded racket with a dry, firm hit and real punishment behind clean contact. It does not manufacture easy depth for you; it rewards players who accelerate through the ball and stay precise.

Its teardrop shape, medium balance, and hard feel put it closer to a controlled power racket than a forgiving all-rounder. I see it in the hands of an advanced player who builds points well from the baseline, then wants to take over through overhead pressure.

Technical analysis

Shape & balance

The teardrop shape gives the Electra ST4 RL more usable control than a full diamond, and the medium balance keeps it manageable. It comes through quickly enough at the net, yet the stiff build still makes volleys and overheads land with authority.

That stiff build also explains its main limitation. The sweet spot is not especially broad, and contact slightly high on the face can lose response abruptly. Players coming from an AT10-style racket or the softer Electra ST4 Pro will likely notice that this one asks for cleaner timing.

Materials & construction

Siux uses a 3K carbon frame, 12K carbon faces, and an EVA Hard core. On court, that construction translates into a direct response rather than a springy one. The ball exit is restrained at low speed, but the racket gives back plenty once I commit to the stroke.

Compared with the ST4 Pro, the RL feels less bouncy and more rigid. That makes it easier to judge aggressive direction on firm volleys and overheads, though defensive shots without much preparation need more of my own input. It will not rescue a late, passive block the way a softer core can.

On-court feel

Baseline play

From the baseline, I like the precision on low-driven lobs and the ability to send a defensive lob deep when I have time to load. The hard core keeps the ball from jumping unexpectedly, so I can play with a clear sense of depth.

Off-the-wall play is more demanding. Centered contact produces a solid, penetrating ball, but the racket is noticeably less charitable on high off-center hits. If my preparation is late or I catch the ball above the sweet spot, the response drops off rather than carrying the shot through.

At the net

At the net, the Electra ST4 RL feels sharp. Firm volleys come off heavy, and I can press the middle without the face feeling unstable. There is enough maneuverability to react in fast exchanges, although it is not a head-light racket that flicks effortlessly through every improvised block.

Touch shots require a softer hand. A chiquita or drop shot can be placed accurately, but the dry face does not provide much free dwell time. I need to absorb the ball rather than rely on the racket to cushion it.

Bandeja and víbora

This is where the racket makes its case. The firm construction gives a bandeja a low, controlled trajectory, while the víbora benefits from the direct face and stiff build. Players who hit overheads with a full, confident motion will get more bite and penetration than they would from the ST4 Pro.

Smash

The smash is its most natural shot. Clean contact produces serious acceleration and a more forceful finish than the more control-oriented alternatives commonly compared with it. It is not automatic power, though: miss the central zone and that advantage fades quickly.

Conclusion

I would choose the Electra ST4 RL for advanced players who want a hard, direct racket that favors aggressive volleys, overheads, and the smash. It has more offensive authority than the ST4 Pro while keeping enough control to construct points rather than simply swing at everything.

The trade-off is clear: a smaller, more demanding sweet spot and less help in rushed defense. Players wanting easy ball exit, a softer touch, or forgiveness on imperfect contact should look elsewhere.