Try to engage him in short bursts instead of going toe-to-toe with him. Preventing him from attacking consecutively drastically lowers his damage output.
Jax can dodge all incoming attacks for a very short amount of time and stuns enemies in melee range when it ends. Wait to strike him until after his dodge is finished.
The stats provided here feature several vital Vex vs. Jax matchup stats that may help us understand the differences and similarities between these two champs. For instance, Vex’s KDA ratio ([kills + assists] / deaths) of NaN is better than Jax’s ratio of NaN, highlighting that Vex may be more central to their team's team fighting potential than Jax..
Vex typically has a similar longest kill spree as their counter does. On average, they receives less damage than Jax. This is usually reflective of different amounts of tankyness; however, it can also imply that the one champion has less mobility and thus is not able to kite away from further harm when poked or engaged.
Both League champions are great. Both champs have their strengths, weaknesses, and counters. In League's current meta, Vex usually loses when trying to fight Jax, with a 47.2% win rate. Therefore, Vex makes a poor counter for Jax.
While Vex does have a lower win rate than Jax, when facing one another, Vex also has a much lower difficulty level that makes them a less time consuming character to pick up and master. You should be very concerned when picking Vex into Jax.
Additionally, Vex has some amount of CC and other utility, a similar amount to Jax. This often makes her just as valuable during teamfights, especially when trying to counter champions with a ton of burst damage.
While there is not one best champion in League of Legends, in Vex vs Jax matchups, Jax is the better champ with a lower win rate, less champion complexity, and a similar amount of utility to help out your team members during team fights.
Vex is a terribly counter for Jax. You will do well by focussing your actions on keeping up your gold and cs and taking out objectives. If you do that, you should be able to stand on your own as Vex against Jax.
If you would like to truly master Vex in order to counter Jax 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 listen to the build and suggestions shown here, you will grow your win rate significantly and be closer to League of Legends pro players.
Vex usually accumulates a similar amount of CS relative to Jax. Champions who typically don't take much CS usualy don't require much CS to be effective, such as sup champs. They are capable of scaling properly off of their abilities and first items alone. Yet, champs with a lot of CS, such as hyper-carries, often require many items to be effective. In either situation, try to exceed the values displayed on this page to do well.
The best items to use in your Vex versus Jax build include Cryptbloom, Shadowflame, and Luden's Companion. When Vex incorporated at least these three items in their build, they did a lot better countering Jax than with many other typical item sets. In fact, Vex boasted an average win rate of 47.2% when countering Jax with this counter build.
To have the highest probability of coming out on top against Jax as Vex, you should take the Dark Harvest, Taste of Blood, Eyeball Collection, Ultimate Hunter, Manaflow Band, and Transcendence runes from the Domination and Sorcery rune sets. Of all the runes we have analyed for Vex vs Jax fights, this mixture of runes resulted in the best win rate. Moreover, these runes provided a 47.2% winrate overall.
If you would like to see Vex versus Jax tips and builds for a a distinct player tier, feel free to choose one from the selection menu shown above. At first, the statistics and build suggestions displayed are calculated using all matches with data with these champs.