Jaycevs Kayn
Jayce vs Kayn is a decisive matchup in LoL patch 26.19. Jayce wins with a 69.2% win rate (+38.5%) over Kayn based on 13 games. Jayce holds the advantage in both the early and late game. Below you'll find the best Jayce build, runes, laning stats, and strategies for the Jayce vs Kayn matchup.
Jayce Matchup Breakdown
Use the dropdown to select an opponent and see a detailed breakdown of how Jayce 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 Jayce vs Kayn?
Jayce wins 60.0% of these games. With this many games the true rate is most likely between 38.7% and 78.1% (95% range).
- Expected
- 48.8% From both champions' overall Jungle win rates
- Matchup effect
- +11.2 pts Observed minus expected
- Sample
- 20 games Lane: Jungle
- vs patch 26.18
- — Not enough games on both patches
Lane: Jungle · Ranked Solo/Duo & Flex · North America server · All ranks · Patch 26.19 · Sep 24 – Sep 28
They also met in another lane (Top): 5 games, Jayce won 100.0%.
Key takeaways
- Current data slightly favors Jayce, but the sample is too limited for a strong conclusion: Jayce wins 60.0% of 20 games (95% range 38.7–78.1%).
- Both champions' overall Jungle win rates predict 48.8% for Jayce; the result is within the margin of error of that, so this matchup mostly reflects the two champions' general strength.
- Jayce players pick The Collector far more often against Kayn: 2.8% of their other Jungle games, 20.0% 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 Jayce and Kayn 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 Jayce'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.
Jayce vs Kayn Laning Stats
Only 20 games have a 15-minute snapshot so far — the lane-phase numbers appear from 30.
Whole-game averages
Jayce vs Kayn Win Rate by Game Length
Jayce's win rate against Kayn 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: Jayce's results against Kayn in short and long games are within the margin of error of each other.
Jayce vs Kayn 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 Jayce Changes Against Kayn
Choices Jayce players make noticeably more or less often in this matchup than in their other Jungle games.
The CollectorItemUsually2.8%vs Kayn20.0%+17.2 pts
Infinity EdgeItemUsuallyunder 0.5%vs Kayn5.0%+5.0 pts
Mosstomper Seedling + Health PotionStarting itemsUsuallyunder 0.5%vs Kayn5.0%+5.0 pts
Mosstomper Seedling + Health Potion + Stealth WardStarting itemsUsually0.5%vs Kayn5.0%+4.5 pts
Best Jayce Build vs Kayn
Usual Jayce build (Jungle)
100.0% win rate · 10 games
Against Kayn
Not enough matchup-specific build data: only 2 of 17 Jayce games against Kayn carried a complete build, which is too few to recommend an item path from. Use Jayce's standard build instead.
- Skill priority: Q > W > E — 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 Jayce Runes vs Kayn
Usual Jayce runes (Jungle)
First Strike
51.1% win rate · 135 games
Against Kayn
Too few games for a matchup-specific rune page yet — use the usual page.
Plan your Jayce 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
Jayce matchup data for League of Legends patch 26.19. The table below shows Jayce'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 Jayce build, runes, laning stats, and early vs late game analysis for that specific matchup.
Other Jayce Matchups
Hardest for Jayce
Easiest for Jayce
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.
Jayce vs Kayn FAQ - Patch 26.19
Who wins Jayce vs Kayn?
Current data slightly favors Jayce, but the sample is too limited for a strong conclusion: Jayce wins 60.0% of 20 games (95% range 38.7–78.1%).
What is Jayce's win rate against Kayn?
Jayce wins 60.0% of 20 Jungle games against Kayn on patch 26.19 (95% range 38.7–78.1%). Based on both champions' overall Jungle win rates, 48.8% would be expected.
Does Jayce counter Kayn?
Not clearly. Jayce wins 60.0% of 20 games against Kayn, and the 95% range (38.7–78.1%) includes 50%, so neither champion reliably counters the other on current data.
Who wins lane, Jayce or Kayn?
There are not enough games with a 15-minute snapshot yet (20) to say who wins lane.
Does Jayce outscale Kayn?
There are too few games of each length to tell yet.
When is Kayn strongest against Jayce?
On current data there is no stage of the game where Kayn is ahead of Jayce beyond the margin of error.
What should Jayce build against Kayn?
There are not enough games for a matchup-specific core, so use Jayce's usual Jungle core: Voltaic Cyclosword, Edge of Night, Bastionbreaker. The biggest change against Kayn: The Collector (2.8% usually, 20.0% here).
What runes should Jayce use against Kayn?
Use Jayce's usual First Strike page (Inspiration + Precision); there are too few games for a matchup-specific page.