How are champion matchup win rates calculated?

Win rates are calculated from thousands of ranked games in Emerald+ elo on the current patch. Data is sourced from OP.GG and updated regularly.

What does a 55% win rate matchup mean?

A 55% win rate means Champion 1 wins 55 out of every 100 games against Champion 2 in ranked. Anything above 52% is considered a favorable matchup.

Do matchup win rates change every patch?

Yes. Champion buffs, nerfs, item changes, and meta shifts can all affect matchup win rates. Our data updates with each new patch.

Should I always pick the counter champion?

Not necessarily. Comfort and experience on a champion often matter more than counter-picking, especially below Diamond. A 2-3% win rate difference is easily overcome by champion mastery.

What rank is the matchup data from?

All matchup data is sourced from Emerald+ ranked games to ensure the data reflects skilled play. Lower elo matchups can differ significantly.

Patch 26.9 Data

Champion Matchups

Pick two champions and see who wins. Win rates, counters, and tips powered by live ranked data.

Champion 1

Kai'Sa

Champion 2

Karthus

44.7%

Kai'Sa win rate vs Karthus

Karthus hard counters Kai'Sa

311

Games Analyzed

44.7%

Kai'Sa WR

55.3%

Karthus WR

-424

Avg Gold Diff @15

Power Spike Timeline

Kai'Sa Level 6

Karthus Level 6

Karthus 1 item

Kai'Sa Q evolve

Kai'Sa 2 items

Karthus 3 items

How to Play This Matchup

Power Curve

Kai'Sa is strongest mid game while Karthus peaks late game. Play around your power window.

Mixed Resistances

Kai'Sa deals Mixed damage while Karthus deals AP. Build resistances accordingly Ã¢â‚¬â€ don't stack the wrong type.

Hit and Run

Kai'Sa needs to combo and back off. Don't stay in extended trades against Karthus's sustained damage. Short trades, then disengage.

Exploit Kai'Sa's Weakness

Kai'Sa's main weakness: Short range, weak early, needs evolves to function. Play around this to maximize your advantage.

Kai'Sa Win Condition

Evolve abilities, R into backline or R for safety, hybrid damage

Karthus Win Condition

R global damage, passive keeps dealing damage after death

Recommended Items

Kai'Sa

Kraken Slayer

Core

Build every game

Nashor's Tooth

Core

Build every game

Rabadon's

Core

Build every game

Mercury's Treads

Defensive

MR + tenacity vs Karthus's AP damage and CC

Karthus

Liandry's Anguish

Core

Build every game

Shadowflame

Core

Build every game

Rabadon's

Core

Build every game

Zhonya's Hourglass

Counter

Stasis to survive assassin burst

Kai'Sa's Worst Matchups

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