Jaycevs Illaoi
Jayce vs Illaoi is a decisive matchup in LoL patch 26.19. Illaoi wins with a 75.0% win rate (+50.0%) over Jayce based on 16 games. Illaoi 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 Illaoi 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 Illaoi?
Jayce wins 40.5% of these games. With this many games the true rate is most likely between 27.0% and 55.5% (95% range).
- Expected
- 47.3% From both champions' overall Top win rates
- Matchup effect
- −6.8 pts Observed minus expected
- Sample
- 42 games Lane: Top
- vs patch 26.18
- — Not enough games on both patches
Lane: Top · Ranked Solo/Duo & Flex · North America server · All ranks · Patch 26.19 · Sep 24 – Sep 28
Key takeaways
- Current data slightly favors Illaoi, but the sample is too limited for a strong conclusion: Jayce wins 40.5% of 42 games (95% range 27.0–55.5%).
- Both champions' overall Top win rates predict 47.3% for Jayce; the result is within the margin of error of that, so this matchup mostly reflects the two champions' general strength.
- Illaoi usually wins the lane: 712 gold ahead of Jayce at 15 minutes on average (42 games with a 15-minute snapshot).
- Jayce players pick Manaflow Band much less often against Illaoi: 51.2% of their other Top games, 28.6% 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 Jayce and Illaoi 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 Illaoi Laning Stats
At 15 minutes
Whole-game averages
Jayce vs Illaoi Win Rate by Game Length
Jayce's win rate against Illaoi 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 Illaoi in short and long games are within the margin of error of each other.
Jayce vs Illaoi 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)IllaoiJayce gold at 15: −712
- First itemInsufficient data
- Games under 20 minInsufficient data
- 20–30 min gamesInsufficient data
- 30+ min gamesInsufficient data
What Jayce Changes Against Illaoi
Choices Jayce players make noticeably more or less often in this matchup than in their other Top games.
Manaflow BandRuneUsually51.2%vs Illaoi28.6%−22.6 pts
Stormraider's SurgeKeystoneUsually50.1%vs Illaoi31.0%−19.1 pts
Black CleaverItemUsually16.7%vs Illaoi35.7%+19.0 pts
Absolute FocusRuneUsually44.2%vs Illaoi28.6%−15.7 pts
Legend: AlacrityRuneUsually20.2%vs Illaoi35.7%+15.5 pts
ConquerorKeystoneUsually20.5%vs Illaoi35.7%+15.2 pts
Mortal ReminderItemUsually3.8%vs Illaoi14.3%+10.5 pts
Adaptive Force (flex)Stat shardUsually98.6%vs Illaoi92.9%−5.8 pts38.5% WR here
Best Jayce Build vs Illaoi
Usual Jayce build (Top)
75.0% win rate · 32 games
Against Illaoi
Not enough matchup-specific build data: only 4 of 31 Jayce games against Illaoi 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 Illaoi
Usual Jayce runes (Top)
Stormraider's Surge
46.4% win rate · 496 games
Against Illaoi
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 Illaoi FAQ - Patch 26.19
Who wins Jayce vs Illaoi?
Current data slightly favors Illaoi, but the sample is too limited for a strong conclusion: Jayce wins 40.5% of 42 games (95% range 27.0–55.5%).
What is Jayce's win rate against Illaoi?
Jayce wins 40.5% of 42 Top games against Illaoi on patch 26.19 (95% range 27.0–55.5%). Based on both champions' overall Top win rates, 47.3% would be expected.
Does Jayce counter Illaoi?
Not clearly. Jayce wins 40.5% of 42 games against Illaoi, and the 95% range (27.0–55.5%) includes 50%, so neither champion reliably counters the other on current data.
Who wins lane, Jayce or Illaoi?
Illaoi usually wins the lane: 712 gold ahead of Jayce at 15 minutes on average (42 games with a 15-minute snapshot).
Does Jayce outscale Illaoi?
There are too few games of each length to tell yet.
When is Illaoi strongest against Jayce?
Illaoi is measurably ahead in: Lane (15 min).
What should Jayce build against Illaoi?
There are not enough games for a matchup-specific core, so use Jayce's usual Top core: Voltaic Cyclosword, Serylda's Grudge, Edge of Night. The biggest change against Illaoi: Black Cleaver (16.7% usually, 35.7% here).
What runes should Jayce use against Illaoi?
Use Jayce's usual Stormraider's Surge page (Sorcery + Inspiration); there are too few games for a matchup-specific page. The biggest change against Illaoi: Manaflow Band (51.2% usually, 28.6% here).