Delaying the activation of Undying Rage is a very effective way to make an enemy champion over-commit to trying to kill you.
If the enemy is stacking Armor, try building items like Last Whisper or Youmuu's Ghostblade.
Bloodlust is an excellent way to heal Tryndamere. Try not to let it fade off before you activate it.
Katarina's abilities deal magic damage, so even if she's building Attack Damage items, get magic resistance to counter her.
Try to save a disable for when Katarina uses her Death Lotus.
The stats provided here clarify several strategic Tryndamere against Katarina counter statistics that may help you figure out the differences between the two. For instance, Tryndamere’s KDA ratio ([kills + assists] / deaths) of NaN is greater than Katarina’s KDA ratio of NaN, highlighting that Tryndamere may be more central to his team's team fighting effectiveness than Katarina..
Tryndamere normally has a slightly smaller longest killing spree than his foe does. Typically, he receives more damage than Katarina. This is usually reflective of differing health capacities, but it can also hint that the champ with more HP has less mobility and thus is unable to escape further harm when engaged or poked.
Both League champions are great champions. Both champs have their strengths, weaknesses, and counters. In the game's current meta, Tryndamere usually wins when taking on Katarina, with a 52.9% win rate. Thus, Tryndamere makes a good counter for Katarina.
While Tryndamere does have a higher winrate than Katarina, when they face off with one another, Tryndamere also has a lower learning curve that makes him a less challenging champ to pick up and master. You should be be fine when picking Tryndamere into Katarina.
Moreover, Tryndamere has almost no amount of CC and other utility, a similar amount to Katarina. This often makes her just as valuable during teamfights, especially when trying to counter champions with a lot of burst damage.
While there isn't a single best champion for every situation in League of Legends, in Tryndamere vs Katarina matchups, Tryndamere is the better champ with a noticably higher win rate, less champion complexity, and a similar amount of utility to help out your allied champions during teamfights.
Tryndamere is a good counter to Katarina. You will do well by focussing your strategy on keeping up your gold and cs and destroying objectives. If you can do that, you should be able to stand on your own as Tryndamere against Katarina.
To truly master Tryndamere to counter Katarina during both the early game and mid / late game phases of League of Legends, you should continue reading to pick up a few extra lessons on this matchup. If you pay attention to the build and tips shown above, you should increase your win rate significantly and be that much closer to League of Legends pro players.
Tryndamere typically gets a similar amount of CS relative to Katarina. Champions who on average don't acquire many minion kills often don't have to have much CS to be effective, such as supports. These kinds of champions 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 need many items to be effective. In either situation, try to surpass the numbers shown on this page to do well.
The most important items to prioritize in your Tryndamere versus Katarina build consist of Mortal Reminder, Guinsoo's Rageblade, and Navori Quickblades. When Tryndamere used at least these three items in his build, he did significantly better versus Katarina than with most other typical builds. In fact, Tryndamere had an average winrate of 52.9% when playing against Katarina with this counter build.
To have the greatest chance of crushing Katarina as Tryndamere, you should equip the Lethal Tempo, Triumph, Legend: Tenacity, Last Stand, Second Wind, and Unflinching runes from the Precision and Resolve rune sets. Of all the rune combinations that we analyzed for Tryndamere vs Katarina LoL games, this composite of runes resulted in the highest win rate. Notably, these runes provided a 52.9% win rate overall.
By default, tips, stats, and builds on how to beat Katarina as Tryndamere are displayed for all skill levels combined. If you would like to filter the stats and builds to an individual player tier, you can use the selection menu above.