The top picks outside of lane to counter Viktor include Xayah, Kai'Sa, and Kalista. These champs are all good at countering Viktor with decent win rates over 55%. Even if these Viktor counter picks are not taken opposite your position, it's not smart to take him into one of these matchups. They will usually win against Viktor.
Conversely, if the enemy team picks either Seraphine or Teemo, Viktor mains should strongly think about selecting him, as he easily wins against these champions with win rates over 54% against each ofthem.
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