“Stupaczuk's 2025 ST4 scores like an attack frame that never loses its head: power 88 with control 76 suits a player who builds pressure with heavy drives and finishes the first ball that sits up.”
Overall it sits in the top 5% of 1,000 rackets we’ve tested — its power score ranks in the top 8%.
Power
Very High88
Control
High76
Maneuverability
High71
Sweet Spot
Good66
Comfort
Good67
Value
Very High80
Owner feedback
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Power
Control
Maneuverability
Comfort
Sweet Spot
Value
PRR Score
89PRR Score
Our verdict
Stupaczuk's 2025 ST4 scores like an attack frame that never loses its head: power 88 with control 76 suits a player who builds pressure with heavy drives and finishes the first ball that sits up. Comfort 67 and tolerance 66 describe a firm, honest strike that expects decent contact in return. Full specification for this edition is unconfirmed, so we will not claim materials or balance we cannot verify. What we can verify is the price trend: value 80 makes last season's signature Siux one of the better buys in the attacking bracket. Demo it if you can; buy with confidence if the character fits your game.
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Full specification
Control
Shape
Round
Level
Intermediate
Playing style
Versatile
Year
2025
The series story
SIUX Electra
Stupa's hybrid line, from ST2 to ST5
The SIUX Electra is built around a specific kind of game. Franco "Stupa" Stupaczuk plays at full intensity at the net, finishes points overhead, and is never out of a rally through the glass. SIUX designed the Electra to match that: a hybrid shape that sits between a control-first round and a pure power diamond, loading up genuine finishing pace while keeping a face soft enough to play touch padel. That balance is harder to achieve than most brands admit, and the Electra has been one of the few rackets in our database to genuinely hold both ends of it.
We have tracked the line across three generations. The 2023 ST2 Pro scored 85 with us and set the Electra template: fast through the air, composed under pressure, with a face that let you redirect a vibora or place a clean bandeja without needing to think twice. The 2024 ST3 arrived with a stiffer hitting surface and better stability when opponents loaded pace at you; the ST3 Stupa scored 87, with Lite editions widening the family to lighter swing weights for improvers. The current ST5 Pro editions, Fire Red and Shadow Stupa, both score 91, the highest result SIUX has achieved in our database.
Each generation follows the same structure: a Stupa Pro edition at the top, designed for attacking players who want to smash overhead and still play a composed bajada off the back wall, with Lite and Go trims below for players building toward that kind of game. The ST generation number is the real thread through the range, and what the Electra has consistently rewarded is a particular construction of points: build through the glass, close at the net, finish overhead.
Which one should you buy?
Go straight to an Electra ST5 Pro edition if your budget allows. Both the Fire Red and the Shadow Stupa score 91 with us, and there is no meaningful performance difference between the two colourways. This is the most complete version of the Electra we have tested: it finishes points overhead with authority, stays composed under pressure in the back-court, and gives you enough feel at the net to play a proper bandeja when the rally demands placement over pace. If you find ST3 Stupa stock at clearance, a PRR 87 result is hard to argue with at a sharp enough discount. It remains a clean, capable racket and the gap to the ST5 barely registers on court when the price is right.
The Lite and Go editions are not lesser Electras so much as a different racket in character. Less swing weight, a softer overall response, better suited to players still developing consistency than to attacking players looking to load genuine finishing pace. They are honest options at the right price, but if you are after the full Electra experience, a Pro edition is the one to buy.
An attack frame that never loses its head: heavy drives build the pressure, and the first ball that sits up gets finished. The build quality is Siux's top line and the price has drifted down since newer versions arrived. Spec documentation is unconfirmed, so demo before you buy, expect a firm strike with modest mishit forgiveness, and check the current-year model if you want the latest build.
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