Master Yivs Karthus
Master Yi vs Karthus is a decisive matchup in LoL patch 26.19. Master Yi wins with a 53.9% win rate (+7.7%) over Karthus based on 26 games. Karthus wins the early laning phase while Master Yi scales better into the late game. Below you'll find the best Master Yi build, runes, laning stats, and strategies for the Master Yi vs Karthus matchup.
Master Yi Matchup Breakdown
Use the dropdown to select an opponent and see a detailed breakdown of how Master Yi performs against them. You'll get head-to-head win rates, laning stats, the best build and runes for the matchup, and early vs late game analysis — all based on real ranked data.
Who wins Master Yi vs Karthus?
Master Yi wins 50.7% of these games. With this many games the true rate is most likely between 39.5% and 61.8% (95% range).
- Expected
- 51.9% From both champions' overall Jungle win rates
- Matchup effect
- −1.2 pts Observed minus expected
- Sample
- 73 games Lane: Jungle
- vs patch 26.18
- +2.5 pts Within normal patch-to-patch noise
Lane: Jungle · Ranked Solo/Duo & Flex · North America server · All ranks · Patch 26.19 · Sep 24 – Sep 28
Key takeaways
- Master Yi vs Karthus is an even matchup: Master Yi wins 50.7% of 73 games, and the 95% range (39.5–61.8%) comfortably includes 50%.
- Both champions' overall Jungle win rates predict 51.9% for Master Yi; the result is within the margin of error of that, so this matchup mostly reflects the two champions' general strength.
- Neither side reliably wins the lane: the average gold difference at 15 minutes is 48, within the margin of error (73 games).
- Master Yi players pick Wit's End far more often against Karthus: 13.9% of their other Jungle games, 27.4% here.
How we calculate this
Games: ranked Solo/Duo and Flex games on the North America server from the patch shown. Remakes (games under 5 minutes) are excluded.
A game only counts when Master Yi and Karthus played the same position on opposite teams, so roaming, lane swaps within a team or a champion merely being in the same game never count as this matchup.
The 95% range is a Wilson score interval. Confidence comes from how wide that range is: within ±3 points is very high, ±5 high, ±8 moderate, anything wider low. Below 20 games a matchup is not classified at all.
Expected win rate combines both champions’ win rates in this lane (same games and filters) with the log5 formula: E = A(1−B) / (A(1−B) + B(1−A)). Matchup effect = observed − expected.
"What changes" compares Master Yi's choices in this matchup with the same champion's other games in the same lane, and lists a change only when it is at least 3 points and statistically significant (two-proportion z-test, |z| ≥ 2, 20+ games).
Results are not split by rank: the sample per rank is too small for honest per-rank matchup numbers.
Master Yi vs Karthus Laning Stats
At 15 minutes
Whole-game averages
Master Yi vs Karthus Win Rate by Game Length
Master Yi's win rate against Karthus by game length. The dot is the win rate, the bar its 95% range and the dashed line the champion's usual win rate at that length. Lengths with fewer than 25 games are left blank.
No game length stands out: Master Yi's results against Karthus in short and long games are within the margin of error of each other.
Master Yi vs Karthus Power Spikes
Who is ahead at each stage, measured from these games. A stage reads "Even" when the difference is inside the margin of error, and "Insufficient data" when there are too few games to tell.
- Lane (15 min)EvenMaster Yi gold at 15: +48
- First itemEvenMaster Yi: 0.2 min · Karthus: 0.2 min
- Games under 20 minInsufficient data
- 20–30 min gamesInsufficient data
- 30+ min gamesEvenMaster Yi wins 48.8% of 43 games
What Master Yi Changes Against Karthus
Choices Master Yi players make noticeably more or less often in this matchup than in their other Jungle games.
Wit's EndItemUsually13.9%vs Karthus27.4%+13.5 pts55.0% WR here
Berserker's GreavesBootsUsually53.2%vs Karthus65.8%+12.6 pts50.0% WR here
Usually6.4%vs Karthus15.1%+8.7 pts
Usually3.8%vs Karthus9.6%+5.8 pts
Scorchclaw Pup + Health Potion + Oracle LensStarting itemsUsually1.3%vs Karthus5.5%+4.2 pts
Best Master Yi Build vs Karthus
Usual Master Yi build (Jungle)
67.2% win rate · 335 games
Against Karthus
Not enough matchup-specific build data: only 8 of 57 Master Yi games against Karthus carried a complete build, which is too few to recommend an item path from. Use Master Yi's standard build instead.
- Master Yi usually completes Gustwalker Hatchling first, at 0.2 min (median of 26 games).
- Karthus usually completes Scorchclaw Pup first, at 0.2 min (median of 58 games).
- Skill priority: Q > E > W — the same as usual.
Builds are ranked by the lower edge of their win rate range, not the raw win rate, so a build seen in a handful of wins never outranks a proven one.
Best Master Yi Runes vs Karthus
Usual Master Yi runes (Jungle)
Lethal Tempo
82.4% win rate · 17 games
Against Karthus
Too few games for a matchup-specific rune page yet — use the usual page.
Plan your Master Yi draft in Draft Lab
Draft Lab lays out both teams lane by lane with live matchup win rates, damage profiles and game-phase lean, and suggests picks and bans from current meta data.
- Full 5v5 draft board
- Lane matchup win rates
- Pick and ban suggestions
Master Yi matchup data for League of Legends patch 26.19. The table below shows Master Yi's win rate, gold difference, and performance stats against every champion in the current meta. Click any champion name to see a detailed head-to-head breakdown including the best Master Yi build, runes, laning stats, and early vs late game analysis for that specific matchup.
Other Master Yi Matchups
Hardest for Master Yi
Easiest for Master Yi
Win rate and games for each matchup. Lists are ranked by the edge of the 95% range so small samples cannot top them; matchups with at least 50 games only.
Help us maintain accuracy! If you notice incorrect stats, missing data, or any issues, your feedback directly improves the quality of our data for the entire community.
Master Yi vs Karthus FAQ - Patch 26.19
Who wins Master Yi vs Karthus?
Master Yi vs Karthus is an even matchup: Master Yi wins 50.7% of 73 games, and the 95% range (39.5–61.8%) comfortably includes 50%.
What is Master Yi's win rate against Karthus?
Master Yi wins 50.7% of 73 Jungle games against Karthus on patch 26.19 (95% range 39.5–61.8%). Based on both champions' overall Jungle win rates, 51.9% would be expected.
Does Master Yi counter Karthus?
Not clearly. Master Yi wins 50.7% of 73 games against Karthus, and the 95% range (39.5–61.8%) includes 50%, so neither champion reliably counters the other on current data.
Who wins lane, Master Yi or Karthus?
Neither side reliably wins the lane: the average gold difference at 15 minutes is 48, within the margin of error (73 games).
Does Master Yi outscale Karthus?
There are too few games of each length to tell yet.
When is Karthus strongest against Master Yi?
On current data there is no stage of the game where Karthus is ahead of Master Yi beyond the margin of error.
What should Master Yi build against Karthus?
There are not enough games for a matchup-specific core, so use Master Yi's usual Jungle core: The Collector, Immortal Shieldbow, Kraken Slayer. The biggest change against Karthus: Wit's End (13.9% usually, 27.4% here).
What runes should Master Yi use against Karthus?
Use Master Yi's usual Lethal Tempo page (Precision + Domination); there are too few games for a matchup-specific page. The biggest change against Karthus: Relentless Hunter (3.8% usually, 9.6% here).