- Win Rate
- 50.1%
- Pick Rate
- 2.0%
- Ban Rate
- 0.9%
Zac vs Karthus
- Patch
- 26.20
- Games
- 4,021
- Lane
- All Lanes
- Tier
- All Tiers
- Last Updated
- Oct 18, 2026 UTC
- Methodology
- Data Methodology
- Author
- Dakota Chinnick
Zac vs Karthus is a decisive matchup in LoL patch 26.20. Karthus wins with a 62.5% win rate (+25.0%) over Zac based on 16 games. Karthus holds the advantage in both the early and late game. Below you'll find the best Zac build, runes, laning stats, and strategies for the Zac vs Karthus matchup.
Zac Matchup Breakdown
Use the dropdown to select an opponent and see a detailed breakdown of how Zac 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 Zac vs Karthus?
Zac wins 40.0% of these games. With this many games the true rate is most likely between 19.8% and 64.3% (95% range).
- Expected
- 50.6% From both champions' overall Jungle win rates
- Matchup effect
- −10.6 pts Observed minus expected
- Sample
- 15 games Lane: Jungle
- vs patch 26.19
- — Not enough games on both patches
Lane: Jungle · Ranked Solo/Duo & Flex · North America server · All ranks · Patch 26.20 · Oct 10 – Oct 18
Key takeaways
- Only 15 Zac vs Karthus games were recorded in the Jungle 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 Zac 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 Zac'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.
Zac vs Karthus Laning Stats
Only 15 games have a 15-minute snapshot so far — the lane-phase numbers appear from 30.
Whole-game averages
Zac vs Karthus Win Rate by Game Length
Zac'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: Zac's results against Karthus in short and long games are within the margin of error of each other.
Zac 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)Insufficient data
- First itemInsufficient data
- Games under 20 minInsufficient data
- 20–30 min gamesInsufficient data
- 30+ min gamesInsufficient data
What Zac Changes Against Karthus
Only 15 games so far — too few to compare what Zac players do in this matchup with their usual choices (needs 20).
Best Zac Build vs Karthus
Usual Zac build (Jungle)
82.4% win rate · 17 games
Against Karthus
Not enough matchup-specific build data: only 0 of 15 Zac games against Karthus carried a complete build, which is too few to recommend an item path from. Use Zac'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 Zac Runes vs Karthus
Usual Zac runes (Jungle)
Aftershock
50.8% win rate · 1,104 games
Against Karthus
Too few games for a matchup-specific rune page yet — use the usual page.
Plan your Zac 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
Zac matchup data for League of Legends patch 26.20. The table below shows Zac'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 Zac build, runes, laning stats, and early vs late game analysis for that specific matchup.
Other Zac Matchups
Hardest for Zac
Easiest for Zac
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.
Zac vs Karthus FAQ - Patch 26.20
Who wins Zac vs Karthus?
Only 15 Zac vs Karthus games were recorded in the Jungle role on patch 26.20 — too few to say who is favored. Treat the numbers below as provisional.
What is Zac's win rate against Karthus?
Zac wins 40.0% of 15 Jungle games against Karthus on patch 26.20 (95% range 19.8–64.3%). Based on both champions' overall Jungle win rates, 50.6% would be expected.
Does Zac counter Karthus?
There are only 15 Zac vs Karthus games in this lane on patch 26.20 — too few to answer reliably yet.
Who wins lane, Zac or Karthus?
There are not enough games with a 15-minute snapshot yet (15) to say who wins lane.
Does Zac outscale Karthus?
There are too few games of each length to tell yet.
When is Karthus strongest against Zac?
On current data there is no stage of the game where Karthus is ahead of Zac beyond the margin of error.
What should Zac build against Karthus?
There are not enough games for a matchup-specific core, so use Zac's usual Jungle core: Liandry's Torment, Hextech Rocketbelt, Sunfire Aegis.
What runes should Zac use against Karthus?
Use Zac's usual Aftershock page (Resolve + Precision); there are too few games for a matchup-specific page.