Kassadin's ultimate has many uses and is on a shorter cooldown than most, use it often.
Kassadin has multiple item paths; he can go caster via Mana and Ability Power or anti-caster with Cooldown Reduction and Magic Resist.
Try to get the Ancient Golem buff to counteract Riftwalk's increasing Mana cost.
Yasuo's shield from Resolve lasts only 2 seconds. Dealing damage to him will trigger it. Wait it out, then engage.
Steel Tempest is very narrow. Dodge laterally if possible.
Yasuo is at his weakest just after he has launched a whirlwind. Engage at that point.
When Yasuo lands two Steel Tempests in a row, his next will fire a tornado. Watch and listen for the associated sound to prepare to dodge.
The stats provided here show some significant Kassadin versus Yasuo matchup stats that can help you appreciate the differences and similarities between the pair. Kassadin’s KDA ratio ([kills + assists] / deaths) of NaN is greater than Yasuo’s ratio of NaN, demonstrating that Kassadin may be more central to his team's team fighting effectiveness than Yasuo..
Kassadin normally has a similar longest kill spree as his foe does. Commonly, he takes more damage than Yasuo. This often reflects differing health capacities, but it can also show that the one champion has less agility and thus is unable to escape further damage when engaged or poked.
Both League of Legends champs are great champions. Both have their pros and cons. In League's current meta, Kassadin usually loses when taking on Yasuo, with a 48.7% win rate. Therefore, Kassadin makes a poor counter for Yasuo.
While Kassadin does have a lower win rate compared to Yasuo, when facing one another, Kassadin also has a lower difficulty level that makes him a less time consuming champ to develop with. You still need to be cautious when picking Kassadin into Yasuoas his relative depth means that you may not be able to reach his full potential without a significant amount of practice beforehand.
Additionally, Kassadin also has some amount of CC and other utility, a similar amount to Yasuo. This makes her just as valuable during teamfights, especially when facing champions with a lot of burst damage.
While there is not one best champion in League of Legends, in Kassadin vs Yasuo matchups, Yasuo is the better champ with a lower win rate, less champion complexity, and a similar amount of utility to help out your teammates during late stage team fights.
Kassadin is a somewhat poor counter to Yasuo. You will do well by focussing your gameplay on keeping up your CS and destroying objectives. If you can do that, you should do very well as Kassadin against Yasuo.
If you would like to truly master Kassadin in order to counter Yasuo during both the early game and mid / late game phases of League of Legends, you should continue reading to gather a few extra tips and tricks for this matchup. If you mind the build and suggestions displayed above, you should grow your win rate significantly and be closer to League of Legends pro players.
Kassadin most often gets a similar amount of CS relative to Yasuo. Champs who on average don't earn much CS typically don't have to have much CS to be valuable teammates, such as sup champs. They are capable of scaling well off of their skills, stats, and first items alone. Yet, champs with large amounts of CS, such as hyper-carries, typically have to have many items to be effective. In either case, try to surpass the values displayed on this page to do well.
The top items to prioritize in your Kassadin versus Yasuo build include Rabadon's Deathcap, Malignance, and Rod of Ages. When Kassadin bought at least these three items in his build, he performed a lot better against Yasuo than with most other common builds. In fact, Kassadin boasted an average winrate of 48.7% battling Yasuo with these items in his kit.
To have the best probability of crushing Yasuo as Kassadin, you should use the First Strike, Magical Footwear, Future's Market, Cosmic Insight, Sudden Impact, and Ultimate Hunter runes from the Inspiration and Domination rune sets. Of all the rune combinations players picked for Kassadin vs Yasuo battles, this combination of runes yielded the best win rate. Moreover, these runes averaged a 48.7% winrate overall.
If you would like to view Kassadin vs Yasuo tips and counter builds for a a particular rank, feel free to choose one from the selection menu provided above. By default, the stats and strategies given are calculated using every round finished with these champs.