

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.
D2+ Champions Analysed: 3,830,873
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 bottom vs middle Counters
Presently there is insufficent games played by Karthus bottom on Patch 15.9 to determine the strongest middle counters. A matchup requires a minimum of 100 games to be displayed.


Sylas
the Unshackled
Karthus wins against Sylas 53.52% of the time which is 3.71% higher against Sylas than the average opponent.
After normalising both champions win rates Karthus wins against Sylas 0.88% less often than would be expected.
The average opponent winrate against Sylas is 49.81%.


Yasuo
the Unforgiven
Karthus wins against Yasuo 54.21% of the time which is 4.43% higher against Yasuo than the average opponent.
After normalising both champions win rates Karthus wins against Yasuo 0.16% less often than would be expected.
The average opponent winrate against Yasuo is 49.78%.


Ahri
the Nine-Tailed Fox
Karthus wins against Ahri 56.13% of the time which is 7.30% higher against Ahri than the average opponent.
After normalising both champions win rates Karthus wins against Ahri 2.71% more often than would be expected.
The average opponent winrate against Ahri is 48.83%.


Syndra
the Dark Sovereign
Karthus wins against Syndra 60.34% of the time which is 10.95% higher against Syndra than the average opponent.
After normalising both champions win rates Karthus wins against Syndra 6.36% more often than would be expected.
The average opponent winrate against Syndra is 49.39%.