The champions that counter Cassiopeia hardest in top lane are Heimerdinger (38.1%), Ziggs (38.1%) and Neeko (40%) — those are Cassiopeia's own pooled win rates. The easiest matchups are Aurora (67.82%), Zac (64.62%) and Galio (61.24%).
71 researched matchup guides for Cassiopeia in top lane, most-played first. Win rates are Cassiopeia's side, pooled Emerald+ games sampled July 2026.
| Matchup | Win rate | Games | Favour |
|---|---|---|---|
| Cassiopeia vs Sion | 46.28% | 1,262 | Leans Sion |
| Cassiopeia vs Yone | 48.36% | 1,162 | Leans Yone |
| Cassiopeia vs Garen | 45.84% | 1,119 | Leans Garen |
| Cassiopeia vs Darius | 44.99% | 958 | Darius favoured |
| Cassiopeia vs Renekton | 48.89% | 902 | Leans Renekton |
| Cassiopeia vs Aatrox | 49.55% | 886 | Even |
| Cassiopeia vs Ornn | 44.54% | 851 | Ornn favoured |
| Cassiopeia vs Riven | 50.82% | 732 | Leans Cassiopeia |
| Cassiopeia vs Sett | 48.13% | 721 | Leans Sett |
| Cassiopeia vs Shen | 46.84% | 711 | Leans Shen |
| Cassiopeia vs Olaf | 43.9% | 656 | Olaf favoured |
| Cassiopeia vs Dr. Mundo | 44.74% | 637 | Dr. Mundo favoured |
| Cassiopeia vs K'Sante | 52.88% | 590 | Leans Cassiopeia |
| Cassiopeia vs Yorick | 45.77% | 555 | Leans Yorick |
| Cassiopeia vs Jayce | 48.09% | 549 | Leans Jayce |
| Cassiopeia vs Pantheon | 48.4% | 531 | Leans Pantheon |
| Cassiopeia vs Singed | 43.96% | 530 | Singed favoured |
| Cassiopeia vs Yasuo | 49.52% | 525 | Even |
| Cassiopeia vs Zaahen | 47.77% | 494 | Leans Zaahen |
| Cassiopeia vs Malphite | 47.56% | 471 | Leans Malphite |
| Cassiopeia vs Jax | 50.32% | 467 | Even |
| Cassiopeia vs Tryndamere | 44.92% | 443 | Tryndamere favoured |
| Cassiopeia vs Rumble | 51.14% | 438 | Leans Cassiopeia |
| Cassiopeia vs Vayne | 47% | 417 | Leans Vayne |
| Cassiopeia vs Gangplank | 44.84% | 397 | Gangplank favoured |
| Cassiopeia vs Irelia | 50.78% | 386 | Leans Cassiopeia |
| Cassiopeia vs Locke | 45.97% | 385 | Leans Locke |
| Cassiopeia vs Urgot | 45.19% | 374 | Leans Urgot |
| Cassiopeia vs Tahm Kench | 45.25% | 358 | Leans Tahm Kench |
| Cassiopeia vs Lillia | 53.26% | 353 | Leans Cassiopeia |
| Cassiopeia vs Volibear | 47.41% | 348 | Leans Volibear |
| Cassiopeia vs Illaoi | 49.12% | 340 | Leans Illaoi |
| Cassiopeia vs Graves | 53.15% | 333 | Leans Cassiopeia |
| Cassiopeia vs Sylas | 45.85% | 325 | Leans Sylas |
| Cassiopeia vs Teemo | 54.04% | 322 | Leans Cassiopeia |
| Cassiopeia vs Vladimir | 47.34% | 319 | Leans Vladimir |
| Cassiopeia vs Gnar | 46.67% | 315 | Leans Gnar |
| Cassiopeia vs Nasus | 50.34% | 294 | Even |
| Cassiopeia vs Kayle | 41.82% | 275 | Kayle favoured |
| Cassiopeia vs Karma | 55.17% | 261 | Cassiopeia favoured |
| Cassiopeia vs Poppy | 48.26% | 259 | Leans Poppy |
| Cassiopeia vs Fiora | 47.04% | 253 | Leans Fiora |
| Cassiopeia vs Ryze | 49.6% | 252 | Even |
| Cassiopeia vs Lucian | 59.91% | 227 | Cassiopeia favoured |
| Cassiopeia vs Ambessa | 49.77% | 221 | Even |
| Cassiopeia vs Gwen | 44.29% | 219 | Gwen favoured |
| Cassiopeia vs Warwick | 46.19% | 210 | Leans Warwick |
| Cassiopeia vs Camille | 48.21% | 195 | Leans Camille |
| Cassiopeia vs Gragas | 42.39% | 184 | Gragas favoured |
| Cassiopeia vs Cho'Gath | 44.89% | 176 | Cho'Gath favoured |
| Cassiopeia vs Quinn | 44.51% | 173 | Quinn favoured |
| Cassiopeia vs Kennen | 52.73% | 165 | Leans Cassiopeia |
| Cassiopeia vs Wukong | 44.52% | 155 | Wukong favoured |
| Cassiopeia vs Akali | 44.64% | 148 | Akali favoured |
| Cassiopeia vs Kled | 49.32% | 148 | Even |
| Cassiopeia vs Galio | 61.24% | 129 | Cassiopeia favoured |
| Cassiopeia vs Master Yi | 43.8% | 121 | Master Yi favoured |
| Cassiopeia vs Mordekaiser | 59.32% | 118 | Cassiopeia favoured |
| Cassiopeia vs Swain | 44.07% | 118 | Swain favoured |
| Cassiopeia vs Heimerdinger | 38.1% | 105 | Heimerdinger favoured |
| Cassiopeia vs Kassadin | 58% | 100 | Cassiopeia favoured |
| Cassiopeia vs Aurora | 67.82% | 87 | Cassiopeia favoured |
| Cassiopeia vs Sejuani | 49.37% | 79 | Even |
| Cassiopeia vs Trundle | 41.77% | 79 | Trundle favoured |
| Cassiopeia vs Nautilus | 61.04% | 77 | Cassiopeia favoured |
| Cassiopeia vs Akshan | 49.28% | 69 | Even |
| Cassiopeia vs Zac | 64.62% | 65 | Cassiopeia favoured |
| Cassiopeia vs Neeko | 40% | 60 | Neeko favoured |
| Cassiopeia vs Mel | 51.85% | 54 | Leans Cassiopeia |
| Cassiopeia vs Maokai | 58.33% | 48 | Cassiopeia favoured |
| Cassiopeia vs Ziggs | 38.1% | 42 | Ziggs favoured |