- Win Rate
- 44.7%
- Pick Rate
- 0.7%
- Ban Rate
- 0.7%
Cassiopeia vs LeBlanc
- Patch
- 26.19
- Games
- 664
- Lane
- All Lanes
- Tier
- All Tiers
- Last Updated
- Oct 5, 2026 UTC
- Methodology
- Data Methodology
- Author
- Dakota Chinnick
Cassiopeia vs LeBlanc is a decisive matchup in LoL patch 26.19. LeBlanc wins with a 54.5% win rate (+9.1%) over Cassiopeia based on 11 games. LeBlanc wins the early laning phase while Cassiopeia scales better into the late game. Below you'll find the best Cassiopeia build, runes, laning stats, and strategies for the Cassiopeia vs LeBlanc matchup.
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 LeBlanc?
Cassiopeia wins 39.1% of these games. With this many games the true rate is most likely between 22.2% and 59.2% (95% range).
- Expected
- 47.0% From both champions' overall Mid win rates
- Matchup effect
- −7.9 pts Observed minus expected
- Sample
- 23 games Lane: Mid
- vs patch 26.18
- — Not enough games on both patches
Lane: Mid · Ranked Solo/Duo & Flex · North America server · All ranks · Patch 26.19 · Sep 24 – Sep 28
Key takeaways
- Current data slightly favors LeBlanc, but the sample is too limited for a strong conclusion: Cassiopeia wins 39.1% of 23 games (95% range 22.2–59.2%).
- Both champions' overall Mid win rates predict 47.0% 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 Legend: Haste much less often against LeBlanc: 39.0% of their other Mid games, 8.7% 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 LeBlanc 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 LeBlanc Laning Stats
Only 23 games have a 15-minute snapshot so far — the lane-phase numbers appear from 30.
Whole-game averages
Cassiopeia vs LeBlanc Win Rate by Game Length
Cassiopeia's win rate against LeBlanc 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 LeBlanc in short and long games are within the margin of error of each other.
Cassiopeia vs LeBlanc 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 LeBlanc
Choices Cassiopeia players make noticeably more or less often in this matchup than in their other Mid games.
Legend: HasteRuneUsually39.0%vs LeBlanc8.7%−30.3 pts
Coup de GraceRuneUsually54.9%vs LeBlanc82.6%+27.7 pts
Legend: AlacrityRuneUsually0.5%vs LeBlanc4.3%+3.8 pts
Best Cassiopeia Build vs LeBlanc
Usual Cassiopeia build (Mid)
75.0% win rate · 16 games
Against LeBlanc
Not enough matchup-specific build data: only 5 of 16 Cassiopeia games against LeBlanc carried a complete build, which is too few to recommend an item path from. Use Cassiopeia's standard build instead.
- 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 LeBlanc
Usual Cassiopeia runes (Mid)
Deathfire Touch
48.9% win rate · 327 games
Against LeBlanc
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 26.19. 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.
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 LeBlanc FAQ - Patch 26.19
Who wins Cassiopeia vs LeBlanc?
Current data slightly favors LeBlanc, but the sample is too limited for a strong conclusion: Cassiopeia wins 39.1% of 23 games (95% range 22.2–59.2%).
What is Cassiopeia's win rate against LeBlanc?
Cassiopeia wins 39.1% of 23 Mid games against LeBlanc on patch 26.19 (95% range 22.2–59.2%). Based on both champions' overall Mid win rates, 47.0% would be expected.
Does Cassiopeia counter LeBlanc?
Not clearly. Cassiopeia wins 39.1% of 23 games against LeBlanc, and the 95% range (22.2–59.2%) includes 50%, so neither champion reliably counters the other on current data.
Who wins lane, Cassiopeia or LeBlanc?
There are not enough games with a 15-minute snapshot yet (23) to say who wins lane.
Does Cassiopeia outscale LeBlanc?
There are too few games of each length to tell yet.
When is LeBlanc strongest against Cassiopeia?
On current data there is no stage of the game where LeBlanc is ahead of Cassiopeia beyond the margin of error.
What should Cassiopeia build against LeBlanc?
There are not enough games for a matchup-specific core, so use Cassiopeia's usual Mid core: Liandry's Torment, Rylai's Crystal Scepter, Rabadon's Deathcap.
What runes should Cassiopeia use against LeBlanc?
Use Cassiopeia's usual Deathfire Touch page (Sorcery + Precision); there are too few games for a matchup-specific page. The biggest change against LeBlanc: Legend: Haste (39.0% usually, 8.7% here).