- Win Rate
- 49.6%
- Pick Rate
- 0.7%
- Ban Rate
- 0.6%
Karthus vs Fizz
- Patch
- 26.20
- Games
- 1,354
- Lane
- All Lanes
- Tier
- All Tiers
- Last Updated
- Oct 18, 2026 UTC
- Methodology
- Data Methodology
- Author
- Dakota Chinnick
Karthus vs Fizz is a decisive matchup in LoL patch 26.20. Karthus wins with a 66.7% win rate (+33.3%) over Fizz based on 9 games. Karthus holds the advantage in both the early and late game. Below you'll find the best Karthus build, runes, laning stats, and strategies for the Karthus vs Fizz matchup.
Karthus Matchup Breakdown
Use the dropdown to select an opponent and see a detailed breakdown of how Karthus 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 Karthus vs Fizz?
Karthus wins 71.4% of these games. With this many games the true rate is most likely between 35.9% and 91.8% (95% range).
- Expected
- 49.8% From both champions' overall Mid win rates
- Matchup effect
- +21.7 pts Observed minus expected
- Sample
- 7 games Lane: Mid
- vs patch 26.19
- — Not enough games on both patches
Lane: Mid · Ranked Solo/Duo · North America server · All ranks · Patch 26.20 · Oct 11 – Oct 18
Key takeaways
- Only 7 Karthus vs Fizz games were recorded in the Mid role on patch 26.20 — too few to say who is favored. Treat the numbers below as provisional.
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 Karthus and Fizz 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 Karthus'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.
Karthus vs Fizz Laning Stats
Only 7 games have a 15-minute snapshot so far — the lane-phase numbers appear from 30.
Whole-game averages
Karthus vs Fizz Win Rate by Game Length
Karthus's win rate against Fizz 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: Karthus's results against Fizz in short and long games are within the margin of error of each other.
Karthus vs Fizz 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)Insufficient data
- First itemInsufficient data
- Games under 20 minInsufficient data
- 20–30 min gamesInsufficient data
- 30+ min gamesInsufficient data
What Karthus Changes Against Fizz
Only 7 games so far — too few to compare what Karthus players do in this matchup with their usual choices (needs 20).
Best Karthus Build vs Fizz
Against Fizz
Not enough matchup-specific build data: only 0 of 7 Karthus games against Fizz carried a complete build, which is too few to recommend an item path from. Use Karthus's standard build instead.
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 Karthus Runes vs Fizz
Usual Karthus runes (Mid)
Dark Harvest
50.0% win rate · 38 games
Against Fizz
Too few games for a matchup-specific rune page yet — use the usual page.
Plan your Karthus 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
Karthus matchup data for League of Legends patch 26.20. The table below shows Karthus'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 Karthus build, runes, laning stats, and early vs late game analysis for that specific matchup.
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.
Karthus vs Fizz FAQ - Patch 26.20
Who wins Karthus vs Fizz?
Only 7 Karthus vs Fizz games were recorded in the Mid role on patch 26.20 — too few to say who is favored. Treat the numbers below as provisional.
What is Karthus's win rate against Fizz?
Karthus wins 71.4% of 7 Mid games against Fizz on patch 26.20 (95% range 35.9–91.8%). Based on both champions' overall Mid win rates, 49.8% would be expected.
Does Karthus counter Fizz?
There are only 7 Karthus vs Fizz games in this lane on patch 26.20 — too few to answer reliably yet.
Who wins lane, Karthus or Fizz?
There are not enough games with a 15-minute snapshot yet (7) to say who wins lane.
Does Karthus outscale Fizz?
There are too few games of each length to tell yet.
When is Fizz strongest against Karthus?
On current data there is no stage of the game where Fizz is ahead of Karthus beyond the margin of error.
What should Karthus build against Fizz?
There are not enough games for a matchup-specific core, so use Karthus's usual Mid core: Stormsurge, Shadowflame, Malignance.
What runes should Karthus use against Fizz?
Use Karthus's usual Dark Harvest page (Domination + Sorcery); there are too few games for a matchup-specific page.