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.
When Rek'Sai is near, she can see the position of you and your allies, but only if you're moving.
If you see one of Rek'Sai's tunnels, briefly stand on one of the entrances to destroy it.
Rek'Sai's Furious Bite gains damage as she builds Fury. Be very careful around her when her Fury is full.
The stats shown on this page show several influential Jax against Rek'Sai matchup statistics that may help you understand the distinctions between the pair. For instance, Jax’s KDA ratio ([kills + assists] / deaths) of NaN is more than Rek'Sai’s ratio of NaN, showing that Jax may be more central to his team's team fighting capability than Rek'Sai..
Jax often has a similar longest killing spree as his matchup does. On average, he receives less damage than Rek'Sai. This often reflects differing health capacities; however, it can also imply that the one champ has less agility and thus is not able to kite away from further harm when poked or engaged.
Both League of Legends champs are great champions. Both have their strengths, weaknesses, and counters. In the game's current meta, Jax usually wins when taking on Rek'Sai, with a 52.0% win rate. Therefore, Jax makes a good counter for Rek'Sai.
While Jax does have a higher win rate compared to Rek'Sai, when on opposite teams, Jax also has a greater learning curve that makes him a more time consuming character to develop with. You still need to be cautious when picking Jax into Rek'Sai.
Moreover, Jax has some amount of CC and other utility, a similar amount to Rek'Sai. 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 for every situation in League of Legends, in Jax vs Rek'Sai matchups, Jax is the better champion with a higher win rate, more champion depth, and a similar amount of utility to help out your team members during late stage team fights.
Jax is a decent counter to Rek'Sai. You will do well by focussing your play on keeping up your CS and taking out objectives. If you can do that, you should hold your own as Jax against Rek'Sai.
To learn all of the intricacies of Jax in order to counter Rek'Sai during both the laning and mid / late game phases of League of Legends, you should keep reading to pick up a few extra tips and tricks for this matchup. If you mind the build and stats shown above, you will increase your win rate significantly and be that much closer to League of Legends pro players.
Jax typically accumulates much more CS relative to Rek'Sai. Champions who typically don't acquire many minion kills often don't need much CS to be effective, such as support champions. They are capable of scaling properly off of their abilities and first items alone. Yet, champs with large amounts of CS, such as hyper-carries, usually require several high cost items to be effective. In either case, try to surpass the numbers displayed here to do well.
The most crucial items to prioritize in your Jax versus Rek'Sai build include Trinity Force, Titanic Hydra, and Sundered Sky. When Jax incorporated at least these three items in his build, he did much better countering Rek'Sai than with most other typical builds. In fact, Jax had an average win rate of 52.0% when countering Rek'Sai with this counter build.
To have the greatest probability of vanquishing Rek'Sai as Jax, you should take the Lethal Tempo, Triumph, Legend: Alacrity, Last Stand, Cosmic Insight, and Magical Footwear runes from the Precision and Inspiration rune sets. Of all the rune builds players picked for Jax vs Rek'Sai counterpicks, this combo of runes yielded the highest win rate. Notably, these runes gave a 52.0% win rate overall.
If you want to get Jax vs Rek'Sai tips and builds for a a distinct rank, feel free to choose one from the selection menu provided above. If viewing for the first time, the stats and guides shown are calculated using all matches with data with these champs.