The greatest champs out of lane to counter Sion include Kai'Sa, Zeri, and Samira. These are all great at countering Sion with decent win rates over 57%. Even if these Sion counter picks are not chosen in your lane, it's not smart to choose him into any of these matchups. They will usually win against Sion.
Yet, if the other team brings either Lillia or Swain, you should strongly consider picking him, as he easily destroys these selections with win rates over 54% against both ofthem.
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