- Win Rate
- 48.8%
- Pick Rate
- 1.4%
- Ban Rate
- 1.6%
Cassiopeia vs Jayce
- Patch
- 26.22
- Games
- 2,643
- Lane
- All Lanes
- Tier
- All Tiers
- Last Updated
- Nov 14, 2026 UTC
- Author
- Dakota Chinnick
- Methodology
- Data Methodology
Cassiopeia vs Jayce (Top): Cassiopeia wins 55.6% of 27 ranked games over the last 2 patches. Matchup build, runes and lane stats for patch 26.22.
Cassiopeia55.6%
Current data slightly favors Cassiopeia, but the sample is too limited for a strong conclusion: Cassiopeia wins 55.6% of 27 games (95% range 37.3–72.4%).
Cassiopeia Matchup Breakdown
Use the dropdown to select an opponent and see a detailed breakdown of how Cassiopeia 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 Cassiopeia vs Jayce?
Cassiopeia wins 55.6% of these games. With this many games the true rate is most likely between 37.3% and 72.4% (95% range).
- Expected
- 50.7% From both champions' overall Top win rates
- Matchup effect
- +4.9 pts Observed minus expected
- Sample
- 27 games Lane: Top · Patch 26.21–26.22
- vs patch 26.21
- — Not enough games on both patches
Lane: Top · Ranked Solo/Duo & Flex · North America server · All ranks · Patch 26.21–26.22 · Oct 31 – Nov 14
The headline win rate covers patches 26.21–26.22 (27 games). The lane, game-length, build and rune sections below use patch 26.22 only (24 games).
They also met in another lane (Mid): 7 games, Cassiopeia won 71.4%.
Key takeaways
- Current data slightly favors Cassiopeia, but the sample is too limited for a strong conclusion: Cassiopeia wins 55.6% of 27 games (95% range 37.3–72.4%).
- Both champions' overall Top win rates predict 50.7% for Cassiopeia; the result is within the margin of error of that, so this matchup mostly reflects the two champions' general strength.
- Cassiopeia players pick Precision far more often against Jayce: 57.9% of their other Top games, 95.8% 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 Cassiopeia and Jayce 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 Cassiopeia'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.
Cassiopeia vs Jayce Laning Stats
Only 24 games have a 15-minute snapshot so far — the lane-phase numbers appear from 30.
Whole-game averages
Cassiopeia vs Jayce Win Rate by Game Length
Cassiopeia's win rate against Jayce 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: Cassiopeia's results against Jayce in short and long games are within the margin of error of each other.
Cassiopeia vs Jayce 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 Cassiopeia Changes Against Jayce
Choices Cassiopeia players make noticeably more or less often in this matchup than in their other Top games.
PrecisionSecondary treeUsually57.9%vs Jayce95.8%+37.9 pts52.2% WR here
ConquerorKeystoneUsually37.6%vs Jayce4.2%−33.4 pts
Deathfire TouchKeystoneUsually54.1%vs Jayce87.5%+33.4 pts52.4% WR here
ScorchRuneUsually59.6%vs Jayce91.7%+32.1 pts50.0% WR here
SorcerySecondary treeUsually35.5%vs Jayce4.2%−31.3 pts
Seraph's EmbraceItemUsually75.7%vs Jayce45.8%−29.8 pts
Last StandRuneUsually32.6%vs Jayce4.2%−28.5 pts
Legend: HasteRuneUsually49.4%vs Jayce25.0%−24.4 pts
Best Cassiopeia Build vs Jayce
Usual Cassiopeia build (Top)
51.4% win rate · 70 games
Against Jayce
Not enough matchup-specific build data: only 6 of 15 Cassiopeia games against Jayce carried a complete build, which is too few to recommend an item path from. Use Cassiopeia's standard build instead.
- Jayce usually completes Youmuu's Ghostblade first, at 11.1 min (median of 20 games).
- Skill priority: E > Q > 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 Cassiopeia Runes vs Jayce
Usual Cassiopeia runes (Top)
Conqueror
57.6% win rate · 59 games
Against Jayce
Too few games for a matchup-specific rune page yet — use the usual page.
Plan your Cassiopeia 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
Cassiopeia matchup data for League of Legends patch 26.22. The table below shows Cassiopeia'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 Cassiopeia build, runes, laning stats, and early vs late game analysis for that specific matchup.
Other Cassiopeia Matchups
Hardest for Cassiopeia
Easiest for Cassiopeia
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.
Cassiopeia vs Jayce FAQ - Patch 26.21–26.22
Who wins Cassiopeia vs Jayce?
Current data slightly favors Cassiopeia, but the sample is too limited for a strong conclusion: Cassiopeia wins 55.6% of 27 games (95% range 37.3–72.4%).
What is Cassiopeia's win rate against Jayce?
Cassiopeia wins 55.6% of 27 Top games against Jayce on patch 26.21–26.22 (95% range 37.3–72.4%). Based on both champions' overall Top win rates, 50.7% would be expected.
Does Cassiopeia counter Jayce?
Not clearly. Cassiopeia wins 55.6% of 27 games against Jayce, and the 95% range (37.3–72.4%) includes 50%, so neither champion reliably counters the other on current data.
Who wins lane, Cassiopeia or Jayce?
There are not enough games with a 15-minute snapshot yet (24) to say who wins lane.
Does Cassiopeia outscale Jayce?
There are too few games of each length to tell yet.
When is Jayce strongest against Cassiopeia?
On current data there is no stage of the game where Jayce is ahead of Cassiopeia beyond the margin of error.
What should Cassiopeia build against Jayce?
There are not enough games for a matchup-specific core, so use Cassiopeia's usual Top core: Rod of Ages, Rylai's Crystal Scepter, Seraph's Embrace. The biggest change against Jayce: Seraph's Embrace (75.7% usually, 45.8% here).
What runes should Cassiopeia use against Jayce?
Use Cassiopeia's usual Conqueror page (Precision + Sorcery); there are too few games for a matchup-specific page. The biggest change against Jayce: Precision (57.9% usually, 95.8% here).