Jax benefits greatly from items that have both Ability Power and Attack Damage such as Guinsoo's Rageblade and Hextech Gunblade.
Jax can Leap Strike to friendly units, including wards. You can use them to plan your escape.
It takes 6 spell casts for Kassadin's slow, Force Pulse, to become castable. If he levels up that ability, judiciously use your own skills while laning against him.
Kassadin deals mostly magic damage. If he's doing well consider buying magic resist items like Mercury's Treads and Banshee's Veil.
Each time Kassadin consecutively uses Riftwalk, he pays more and more mana. Keep this in mind as you chase him.
The stat comparisons shown on this page show several significant Jax versus Kassadin counter stats that can help us grasp the differences between the two. As an example, Jax’s KDA ratio ([kills + assists] / deaths) of NaN is better than Kassadin’s KDA ratio of NaN, indicating that Jax may be more central to his team's team fighting capability than Kassadin..
Jax usually has a similar longest kill spree as his counter does. On average, he takes a similar amount of damage to Kassadin. This is usually reflective of different amounts of tankyness, but it can also hint that the champion with increased HP has less mobility and thus is unable to kite away from further harm when engaged or poked.
Both LoL champs are great. Both champs have their strengths, weaknesses, and counters. In the game's current meta, Jax usually fairs equally well when playing against Kassadin, with a 50.5% win rate. As a result, Jax makes an ok counter for Kassadin.
While Jax does have a higher winrate than Kassadin, when facing one another, Jax also has a lower learning curve that makes him a less complex champion to pick up and master. You should be careful when picking Jax into Kassadin.
Furthermore, Jax also has some amount of CC and other utility, a similar amount to Kassadin. This makes her just as valuable during teamfights, especially when facing champions with a lot of burst damage.
While there is not a single best champion for every situation in League of Legends, in Jax vs Kassadin matchups, Jax is the better champ with a similar win rate, less champion complexity, and a similar amount of utility to help out your teammates during team fights.
Jax is a decent counter to Kassadin. Make sure you focus your strategy on keeping up your gold income and destroying objectives. If you do that, you should hold your own as Jax against Kassadin.
If you would like to truly master Jax in order to counter Kassadin during both the laning and mid / late game phases of League of Legends, you should continue reading to learn a few extra tricks and insights into this matchup. If you mind the build and tips shown here, you will grow your win rate by a lot and be that much closer to League of Legends pro players.
Jax on average accumulates a similar amount of CS compared to Kassadin. Champs who on average don't earn much CS usualy don't need much CS to be valuable teammates, such as supports. These kinds of champions are capable of scaling properly off of their abilities and first items alone. Yet, champions with large amounts of CS, such as hyper-carries, often have to have several high cost items to be effective. In either case, try to do better than the numbers displayed here to do well.
The most crucial items to focus on in your Jax versus Kassadin build include Sterak's Gage, Trinity Force, and Spear of Shojin. When Jax incorporated at least these three items in his build, he performed much better against Kassadin than with most other typical item sets. In fact, Jax boasted an average winrate of 50.5% when playing against Kassadin with these items in his kit.
To have the greatest chance of crushing Kassadin as Jax, you should use the Lethal Tempo, Triumph, Legend: Alacrity, Last Stand, Magical Footwear, and Cosmic Insight runes from the Precision and Inspiration rune sets. Of all the rune sets players chose for Jax vs Kassadin LoL games, this blending of runes yielded the highest win rate. In fact, these runes provided a 50.5% win rate overall.
If you would like to view Jax vs Kassadin tips and matchup stats and build suggestions for a a particular division, feel free to choose one from the selection menu shown above. At first, the statistics and strategies shown are computed using all games completed with both champions.