Zacvs Amumu
Zac vs Amumu is a moderate matchup in LoL patch 26.18. Amumu wins with a 51.4% win rate (+2.9%) over Zac based on 35 games. Zac wins the early laning phase while Amumu scales better into the late game. Below you'll find the best Zac build, runes, laning stats, and strategies for the Zac vs Amumu 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 Amumu?
Zac wins 48.5% of these games. With this many games the true rate is most likely between 32.5% and 64.8% (95% range).
- Expected
- 47.0% From both champions' overall Jungle win rates
- Matchup effect
- +1.5 pts Observed minus expected
- Sample
- 33 games Lane: Jungle
Lane: Jungle · Ranked Solo/Duo & Flex · North America server · All ranks · Patch 26.18 · Sep 11 – Sep 14
Key takeaways
- Current data slightly favors Amumu, but the sample is too limited for a strong conclusion: Zac wins 48.5% of 33 games (95% range 32.5–64.8%).
- Both champions' overall Jungle win rates predict 47.0% for Zac; 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 14, within the margin of error (33 games).
- Zac players pick Liandry's Torment far more often against Amumu: 19.5% of their other Jungle games, 39.4% 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 Zac and Amumu 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 Amumu Laning Stats
At 15 minutes
Solo kills are tracked from this patch on — 0 games have them so far, shown from 30.
Whole-game averages
Zac vs Amumu Win Rate by Game Length
Zac's win rate against Amumu 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 Amumu in short and long games are within the margin of error of each other.
Zac vs Amumu 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)EvenZac gold at 15: −14
- First itemInsufficient data
- Games under 20 minInsufficient data
- 20–30 min gamesInsufficient data
- 30+ min gamesInsufficient data
What Zac Changes Against Amumu
Choices Zac players make noticeably more or less often in this matchup than in their other Jungle games.
Usually19.5%vs Amumu39.4%+19.9 pts
ThornmailItemUsually47.2%vs Amumu66.7%+19.4 pts40.9% WR here
Mercury's TreadsBootsUsually27.8%vs Amumu45.5%+17.7 pts
Adaptive Force (offense)Stat shardUsually2.9%vs Amumu9.1%+6.2 pts
Deathfire TouchKeystoneUsuallyunder 0.5%vs Amumu3.0%+3.0 pts
First StrikeKeystoneUsuallyunder 0.5%vs Amumu3.0%+3.0 pts
Biscuit DeliveryRuneUsuallyunder 0.5%vs Amumu3.0%+3.0 pts
Usuallyunder 0.5%vs Amumu3.0%+3.0 pts
Best Zac Build vs Amumu
Usual Zac build (Jungle)
63.5% win rate · 63 games
Against Amumu
Not enough matchup-specific build data: only 4 of 24 Zac games against Amumu carried a complete build, which is too few to recommend an item path from. Use Zac's standard build instead.
- Skill priority: E > W > Q — 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 Zac Runes vs Amumu
Usual Zac runes (Jungle)
Aftershock
50.8% win rate · 508 games
Against Amumu
Too few games for a matchup-specific rune page yet — use the usual page.
Zac matchup data for League of Legends patch 26.18. 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.
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Zac vs Amumu FAQ - Patch 26.18
Who wins Zac vs Amumu?
Current data slightly favors Amumu, but the sample is too limited for a strong conclusion: Zac wins 48.5% of 33 games (95% range 32.5–64.8%).
What is Zac's win rate against Amumu?
Zac wins 48.5% of 33 Jungle games against Amumu on patch 26.18 (95% range 32.5–64.8%). Based on both champions' overall Jungle win rates, 47.0% would be expected.
Does Zac counter Amumu?
Not clearly. Zac wins 48.5% of 33 games against Amumu, and the 95% range (32.5–64.8%) includes 50%, so neither champion reliably counters the other on current data.
Who wins lane, Zac or Amumu?
Neither side reliably wins the lane: the average gold difference at 15 minutes is 14, within the margin of error (33 games).
Does Zac outscale Amumu?
There are too few games of each length to tell yet.
When is Amumu strongest against Zac?
On current data there is no stage of the game where Amumu is ahead of Zac beyond the margin of error.
What should Zac build against Amumu?
There are not enough games for a matchup-specific core, so use Zac's usual Jungle core: Liandry's Torment, Thornmail, Sunfire Aegis. The biggest change against Amumu: Liandry's Torment (19.5% usually, 39.4% here).
What runes should Zac use against Amumu?
Use Zac's usual Aftershock page (Resolve + Precision); there are too few games for a matchup-specific page. The biggest change against Amumu: Adaptive Force (offense) (2.9% usually, 9.1% here).