The greatest champs outside of lane to counter Dr. Mundo include Tristana, Ezreal, and Kai'Sa. These are all good at countering Dr. Mundo with decent win rates over 56%. Even if these Dr. Mundo counter picks are not played in your lane, it's not smart to take him into these matchups. They will often win against Dr. Mundo.
Conversely, if the other team choses either Tristana or Rumble, you should strongly think about taking him, as he easily destroys these champs with win rates over 54% against both ofthem.
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