Kai'Savs Sivir
Kai'Sa vs Sivir is a very close matchup in LoL patch 26.19. Sivir wins with a 50.9% win rate (+1.8%) over Kai'Sa based on 114 games. Kai'Sa wins the early laning phase while Sivir scales better into the late game. Below you'll find the best Kai'Sa build, runes, laning stats, and strategies for the Kai'Sa vs Sivir matchup.
Kai'Sa Matchup Breakdown
Use the dropdown to select an opponent and see a detailed breakdown of how Kai'Sa 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 Kai'Sa vs Sivir?
Kai'Sa wins 51.7% of these games. With this many games the true rate is most likely between 45.3% and 58.1% (95% range).
- Expected
- 50.7% From both champions' overall Bot win rates
- Matchup effect
- +1.0 pts Observed minus expected
- Sample
- 232 games Lane: Bot
- vs patch 26.18
- +6.0 pts Within normal patch-to-patch noise
Lane: Bot · Ranked Solo/Duo & Flex · North America server · All ranks · Patch 26.19 · Sep 24 – Sep 28
Key takeaways
- Current data slightly favors Kai'Sa, but the sample is too limited for a strong conclusion: Kai'Sa wins 51.7% of 232 games (95% range 45.3–58.1%).
- Both champions' overall Bot win rates predict 50.7% for Kai'Sa; the result is within the margin of error of that, so this matchup mostly reflects the two champions' general strength.
- Neither side reliably wins the lane: the average gold difference at 15 minutes is 159, within the margin of error (229 games).
- Kai'Sa players pick Kraken Slayer far more often against Sivir: 64.4% of their other Bot games, 71.6% 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 Kai'Sa and Sivir 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 Kai'Sa'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.
Kai'Sa vs Sivir Laning Stats
At 15 minutes
Whole-game averages
Kai'Sa vs Sivir Win Rate by Game Length
Kai'Sa's win rate against Sivir 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: Kai'Sa's results against Sivir in short and long games are within the margin of error of each other.
Kai'Sa vs Sivir 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)EvenKai'Sa gold at 15: +159
- First itemKai'SaKai'Sa: 10.5 min · Sivir: 11.7 min
- Games under 20 minInsufficient data
- 20–30 min gamesEvenKai'Sa wins 49.4% of 85 games
- 30+ min gamesEvenKai'Sa wins 52.0% of 125 games
What Kai'Sa Changes Against Sivir
Choices Kai'Sa players make noticeably more or less often in this matchup than in their other Bot games.
Kraken SlayerItemUsually64.4%vs Sivir71.6%+7.1 pts52.4% WR here
Usually76.4%vs Sivir82.3%+5.9 pts53.9% WR here
Best Kai'Sa Build vs Sivir
Usual Kai'Sa build (Bot)
82.6% win rate · 23 games
Limited sample: 41 of 189 games finished this exact core, so treat it as an observation rather than a recommendation.
- Kai'Sa usually completes Kraken Slayer first, at 10.5 min (median of 147 games).
- Sivir usually completes Yun Tal Wildarrows first, at 11.7 min (median of 113 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 Kai'Sa Runes vs Sivir
Usual Kai'Sa runes (Bot)
Lethal Tempo
70.4% win rate · 27 games
Against Sivir
Lethal Tempo
56.3% win rate · 103 games
Plan your Kai'Sa 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
Kai'Sa matchup data for League of Legends patch 26.19. The table below shows Kai'Sa'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 Kai'Sa build, runes, laning stats, and early vs late game analysis for that specific matchup.
Other Kai'Sa Matchups
Hardest for Kai'Sa
Easiest for Kai'Sa
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.
Kai'Sa vs Sivir FAQ - Patch 26.19
Who wins Kai'Sa vs Sivir?
Current data slightly favors Kai'Sa, but the sample is too limited for a strong conclusion: Kai'Sa wins 51.7% of 232 games (95% range 45.3–58.1%).
What is Kai'Sa's win rate against Sivir?
Kai'Sa wins 51.7% of 232 Bot games against Sivir on patch 26.19 (95% range 45.3–58.1%). Based on both champions' overall Bot win rates, 50.7% would be expected.
Does Kai'Sa counter Sivir?
Not clearly. Kai'Sa wins 51.7% of 232 games against Sivir, and the 95% range (45.3–58.1%) includes 50%, so neither champion reliably counters the other on current data.
Who wins lane, Kai'Sa or Sivir?
Neither side reliably wins the lane: the average gold difference at 15 minutes is 159, within the margin of error (229 games).
Does Kai'Sa outscale Sivir?
Not measurably: Kai'Sa's win rate against Sivir in games of 25 minutes or less and in longer games is within the margin of error of each other.
When is Sivir strongest against Kai'Sa?
On current data there is no stage of the game where Sivir is ahead of Kai'Sa beyond the margin of error.
What should Kai'Sa build against Sivir?
The most successful Kai'Sa core against Sivir is Kraken Slayer, Terminus, Guinsoo's Rageblade (61.0% over 41 games). The biggest change against Sivir: Kraken Slayer (64.4% usually, 71.6% here).
What runes should Kai'Sa use against Sivir?
Lethal Tempo with Precision and Inspiration — 56.3% over 103 games against Sivir.