Siux Electra Stupa Pro ST4 2025

The Siux Electra Stupa Pro ST4 2025 is the racket Franco Stupaczuk competed with in 2025: a hybrid shape, medium-high balance and 15K carbon faces with a sandy finish. It is designed for advanced and competition players with an all-round but aggressive game who want punch without giving up control.

Siux Electra Stupa Pro ST4 2025 specifications

Who is the Siux Electra Stupa Pro ST4 2025 for?

It suits backhand or forehand-side players who attack often, smash for three and want a firm feel that returns the ball precisely. Its medium-hard feel (7.5/10 according to Siux) rewards good technique and a fast arm. If you are a beginner, have elbow problems or prefer defending from the back, a round racket with a soft feel and low balance will serve you better.

Strengths and things to consider

Strengths

• Controlled punch: the medium-high balance helps on smashes and deep volleys without making the racket feel heavy at the net.
• Precision: 15K carbon and a medium-hard feel give a firm, predictable response on bandejas, víboras and flat shots.
• Spin: the sandy finish grips the ball well on slice and topspin, which helps you close points at the net.

Things to consider

• Demands technique: on slow or poorly accelerated shots the ball comes off with less pace than from soft rackets.
• Less comfortable in defence: the head-heavy weight and firm feel tire the arm more in long matches.

Electra Stupa Pro ST4 2025 compared with Electra Pro 2026 Shadow Red and Fenix Pro 5 2025

The Siux Electra Pro 2026 Shadow Red is the next step in the Electra line: teardrop, medium balance, 12K carbon, 8/10 hardness and a satin finish with sandy texture. It is slightly more manoeuvrable and all-round; the ST4, with its medium-high balance and 15K carbon, leans further towards power for frequent smashers.

The Siux Fenix Pro 5 2025 is a diamond racket with high balance, 24K carbon, a hard 10/10 feel and a 3D finish, built for pure power. Choose it if you live at the net and want maximum smashing power; the Electra ST4 is more balanced and more forgiving in defence and transitions.

Explore more Siux rackets by Franco Stupaczuk, professional-level rackets or all Siux rackets in our catalogue.

Questions about the Siux Electra Stupa Pro ST4 2025

How much does the Siux Electra ST4 weigh?

Siux does not publish the weight on its spec sheet; most specialist shops list 360 to 375 g. That is a medium-high weight which, combined with the medium-high balance, adds momentum to smashes but asks for some arm strength.

Is the Electra ST4 a teardrop or a diamond racket?

Siux calls it hybrid. Its head and medium-high balance place it between the two, but on court it behaves like a teardrop: a larger sweet spot than a diamond and more punch than a round racket.

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