Lead your enemy when targeting with Noxious Blast to ensure the hit.
Use Twin Fang on poisoned stationary targets like monsters and units stunned by her Petrifying Gaze for maximum damage.
Aqua Prison is a very powerful ability with a long cooldown, take advantage of the situation if Nami misses this ability.
Tidal Wave has a very long range but travels slowly, be aware of when it is coming your way as you can move out of its path.
Try to avoid fighting an opponent affected by Tidecaller's Blessing, it lasts a short duration so waiting it out can help you greatly.
The stat comparisons shown on this page clarify several valuable Cassiopeia against Nami matchup statistics that may help you distinguish the distinctions between the pair. As an example, Cassiopeia’s KDA ratio ([kills + assists] / deaths) of NaN is more than Nami’s ratio of NaN, indicating that Cassiopeia may be more central to her team's team fighting effectiveness than Nami. This observation is largely a result of the difference in kills.
Cassiopeia typically has a much larger longest kill spree than her enemy does. Typically, she takes more damage than Nami. This is usually reflective of different amounts of tankyness, but it can also hint that the champion with increased health has less mobility and thus is not able to kite away from additional damage when engaged or poked.
Both League of Legends champions are great. Both have their strengths, weaknesses, and counters. In the game's current meta, Cassiopeia usually wins when taking on Nami, with a 52.1% win rate. Therefore, Cassiopeia makes a good counter for Nami.
While Cassiopeia does have a higher winrate than Nami, when on opposite teams, Cassiopeia also has a much greater learning curve that makes her a more complex champ to learn and master. You don't need to be too worried when picking Cassiopeia into Namias her relative depth means you may not be able to reach her full potential without a lot of practice beforehand.
Moreover, Cassiopeia has a good amount of CC and other utility, a similar amount to Nami. This often makes her just as valuable during teamfights, especially when fighting champions with a ton of burst damage.
While there isn't a single best champion in League of Legends, in Cassiopeia vs Nami matchups, Cassiopeia is the better champ with a noticably higher win rate, more champion depth, and a similar amount of utility to help out your allies during team fights.
Cassiopeia is an above average counter for Nami. You will do well by focussing your strategy on maximizing your gold income and destroying objectives. If you do that, you should do very well as Cassiopeia against Nami.
To truly master Cassiopeia in order to counter Nami during both the laning and mid / late game phases of League of Legends, you should continue reading to learn a few extra tips and tricks for this matchup. If you mind the build and tips presented here, you will increase your win rate by a lot and be closer to League of Legends pro players.
Cassiopeia typically gets much more CS relative to Nami. Champs who typically don't earn much CS typically don't need much CS to be valuable teammates, such as supports. These kinds of champions are able to scale properly off of their abilities and first items alone. Yet, champions with large amounts of CS, such as hyper-carries, typically have to have many items to be effective. In either situation, try to do better than the values reported here to do well.
The best items to use in your Cassiopeia versus Nami build include Seraph's Embrace, Rylai's Crystal Scepter, and Cosmic Drive. When Cassiopeia combined at least these three pieces in her build, she did a lot better versus Nami than with most other common builds. In fact, Cassiopeia had an average winrate of 52.1% when playing against Nami with these items in her kit.
To have the highest probability of beating Nami as Cassiopeia, Cassiopeia players should equip the Conqueror, Presence of Mind, Legend: Tenacity, Last Stand, Manaflow Band, and Transcendence runes from the Precision and Sorcery rune sets. Out of all the rune combinations players picked for Cassiopeia vs Nami fights, this order of runes yielded the highest win rate. Notably, these runes averaged a 52.1% win rate overall.
If you need to see Cassiopeia versus Nami tips and builds for a an individual player tier, feel free to choose one from the selection menu shown above. At first, the statistics and strategies displayed are computed using every game finished with these champs.