This will vary because unlike other stat sites we include 100% of a brackets champions played and never include champions that don't belong in the bracket.
Diamond+ Champions Analysed: 10,792,555
We include 100% of the champions played of every selected tier bracket in our analysis, we never include champions from outside the tier quoted tier.
Karthus Counters
Karthus middle vs support Counters
Presently there is insufficent games played by Karthus middle on Patch 14.7 to determine the strongest support counters. A matchup requires a minimum of 100 games to be displayed.
Nami
Aquamancienne
Karthus wins against Nami 43.44% of the time which is 3.13% lower against Nami than the average opponent.
After normalising both champions win rates Karthus wins against Nami 7.87% less often than would be expected.
The average opponent winrate against Namiis 46.57%.
Janna
Avatar de l'air
Karthus wins against Janna 44.76% of the time which is 0.83% lower against Janna than the average opponent.
After normalising both champions win rates Karthus wins against Janna 5.56% less often than would be expected.
The average opponent winrate against Jannais 45.59%.
Lulu
Sorcière féérique
Karthus wins against Lulu 50.64% of the time which is 2.90% higher against Lulu than the average opponent.
After normalising both champions win rates Karthus wins against Lulu 1.84% less often than would be expected.
The average opponent winrate against Luluis 47.74%.
Nautilus
Titan des profondeurs
Karthus wins against Nautilus 54.10% of the time which is 4.73% higher against Nautilus than the average opponent.
After normalising both champions win rates Karthus wins against Nautilus 0.01% less often than would be expected.
The average opponent winrate against Nautilusis 49.37%.
Thresh
Garde aux chaînes
Karthus wins against Thresh 56.30% of the time which is 9.15% higher against Thresh than the average opponent.
After normalising both champions win rates Karthus wins against Thresh 4.41% more often than would be expected.
The average opponent winrate against Threshis 47.15%.