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.
Grandmaster Champions Analysed: 536,867
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.
Master Yi Counters
Master Yi jungle vs jungle Counters
Presently there is insufficent games played by Master Yi jungle on Patch 30 to determine the strongest jungle counters. A matchup requires a minimum of 100 games to be displayed.
Lee Sin
the Blind Monk
Master Yi wins against Lee Sin 45.90% of the time which is 0.16% higher against Lee Sin than the average opponent.
After normalising both champions win rates Master Yi wins against Lee Sin 10.20% less often than would be expected.
The average opponent winrate against Lee Sinis 45.74%.
Graves
the Outlaw
Master Yi wins against Graves 50.88% of the time which is 6.25% higher against Graves than the average opponent.
After normalising both champions win rates Master Yi wins against Graves 4.10% less often than would be expected.
The average opponent winrate against Gravesis 44.63%.
Viego
The Ruined King
Master Yi wins against Viego 52.90% of the time which is 7.23% higher against Viego than the average opponent.
After normalising both champions win rates Master Yi wins against Viego 3.13% less often than would be expected.
The average opponent winrate against Viegois 45.67%.