Master Yivs Rammus
Master Yi vs Rammus is a decisive matchup in LoL patch 26.18. Rammus wins with a 60.4% win rate (+20.7%) over Master Yi based on 169 games. Rammus holds the advantage in both the early and late game. Below you'll find the best Master Yi build, runes, laning stats, and strategies for the Master Yi vs Rammus 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 Rammus?
Master Yi wins 38.6% of these games. With this many games the true rate is most likely between 31.4% and 46.4% (95% range).
- Expected
- 45.7% From both champions' overall Jungle win rates
- Matchup effect
- −7.1 pts Observed minus expected
- Sample
- 158 games Lane: Jungle
Lane: Jungle · Ranked Solo/Duo & Flex · North America server · All ranks · Patch 26.18 · Sep 11 – Sep 14
Key takeaways
- Rammus is favored in this matchup: Master Yi wins 38.6% of 158 games, and the whole 95% range (31.4–46.4%) is on the same side of 50%.
- Both champions' overall Jungle win rates predict 45.7% for Master Yi; the result is within the margin of error of that, so this matchup mostly reflects the two champions' general strength.
- Master Yi usually wins the lane: 393 gold ahead of Rammus at 15 minutes on average (156 games with a 15-minute snapshot).
- Master Yi players pick Kraken Slayer much less often against Rammus: 82.4% of their other Jungle games, 69.6% 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 Rammus 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 Rammus 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
Master Yi vs Rammus Win Rate by Game Length
Master Yi's win rate against Rammus 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 Rammus in short and long games are within the margin of error of each other.
Master Yi vs Rammus 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)Master YiMaster Yi gold at 15: +393
- First itemEvenMaster Yi: 0.2 min · Rammus: 0.2 min
- Games under 20 minInsufficient data
- 20–30 min gamesEvenMaster Yi wins 41.0% of 61 games
- 30+ min gamesRammusMaster Yi wins 36.5% of 85 games
What Master Yi Changes Against Rammus
Choices Master Yi players make noticeably more or less often in this matchup than in their other Jungle games.
Kraken SlayerItemUsually82.4%vs Rammus69.6%−12.8 pts39.1% WR here
Mercury's TreadsBootsUsually9.0%vs Rammus21.5%+12.5 pts44.1% WR here
Usually48.1%vs Rammus59.5%+11.4 pts37.2% WR here
Best Master Yi Build vs Rammus
Usual Master Yi build (Jungle)
71.2% win rate · 52 games
Against Rammus
43.5% win rate · 23 games
Limited sample: 23 of 112 games finished this exact core, so treat it as an observation rather than a recommendation.
- Master Yi usually completes Gustwalker Hatchling first, at 0.2 min (median of 76 games).
- Rammus usually completes Gustwalker Hatchling first, at 0.2 min (median of 74 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 Rammus
Usual Master Yi runes (Jungle)
Lethal Tempo
61.3% win rate · 62 games
Against Rammus
Too few games for a matchup-specific rune page yet — use the usual page.
Master Yi matchup data for League of Legends patch 26.18. 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.
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Master Yi vs Rammus FAQ - Patch 26.18
Who wins Master Yi vs Rammus?
Rammus is favored in this matchup: Master Yi wins 38.6% of 158 games, and the whole 95% range (31.4–46.4%) is on the same side of 50%.
What is Master Yi's win rate against Rammus?
Master Yi wins 38.6% of 158 Jungle games against Rammus on patch 26.18 (95% range 31.4–46.4%). Based on both champions' overall Jungle win rates, 45.7% would be expected.
Does Master Yi counter Rammus?
No — it is the other way around: Master Yi wins only 38.6% of 158 games against Rammus, and the whole 95% range is below 50%.
Who wins lane, Master Yi or Rammus?
Master Yi usually wins the lane: 393 gold ahead of Rammus at 15 minutes on average (156 games with a 15-minute snapshot).
Does Master Yi outscale Rammus?
There are too few games of each length to tell yet.
When is Rammus strongest against Master Yi?
Rammus is measurably ahead in: 30+ min games.
What should Master Yi build against Rammus?
The most successful Master Yi core against Rammus is Kraken Slayer, Blade of The Ruined King, Guinsoo's Rageblade (43.5% over 23 games). The biggest change against Rammus: Kraken Slayer (82.4% usually, 69.6% here).
What runes should Master Yi use against Rammus?
Use Master Yi's usual Lethal Tempo page (Precision + Domination); there are too few games for a matchup-specific page.