Olaf can combine Berserker Rage, Vicious Strikes, and Ragnarok at low life to become deceptively strong.
The bonus healing granted by Vicious Strikes amplifies your Life Steal from all sources as well as heals from allies.
If Master Yi tries to farm with Alpha Strike, hit him a few times so he has to use mana with Meditate to heal.
Although Master Yi cannot be slowed while using Highlander, other disables can stop him in his tracks.
Meditate is an effective method of healing damage over time, but Master Yi is susceptible to coordinated team ganks early in the game.
The stat comparisons shown on this page show some critical Olaf against Master Yi matchup stats that can help you explain the differences and similarities between the pair. As an example, Olaf’s KDA ratio ([kills + assists] / deaths) of NaN is more than Master Yi’s KDA ratio of NaN, demonstrating that Olaf may be more central to his team's team fighting effectiveness than Master Yi..
Olaf usually has a slightly smaller longest kill spree than his enemy does. Commonly, he receives a similar amount of damage to Master Yi. This is usually reflective of different amounts of tankyness; however, it can also indicate that the champion with increased HP has less agility and thus is not able to escape additional damage when poked or engaged.
Both League of Legends champs are great. Both have their pros and cons. In League's current meta, Olaf usually loses when trying to fight Master Yi, with a 46.9% win rate. Thus, Olaf makes a poor counter to Master Yi.
While Olaf does have a lower winrate than Master Yi, when on opposite teams, Olaf also has a lower difficulty level that makes him a less time consuming champion to develop with. You should expect to face a difficult match when picking Olaf into Master Yi.
Furthermore, Olaf has only a small amount of CC and other utility, a similar amount to Master Yi. This often makes her just as valuable during teamfights, especially when fighting champions with a ton of burst damage.
While there isn't one best champion for every situation in League of Legends, in Olaf vs Master Yi matchups, Master Yi is the better champion with a much lower win rate, less champion complexity, and a similar amount of utility to help out your allied champions during teamfights.
Olaf is a garbage counter to Master Yi. Focus your actions on keeping up your CS and taking out objectives. If you are able to do that, you should do very well as Olaf against Master Yi.
If you would like to truly master Olaf in order to counter Master Yi during both the early game and mid / late game phases of League of Legends, you should continue reading to gather a few extra tricks and insights into this matchup. If you listen to the build and suggestions displayed here, you will increase your win rate significantly and be closer to League of Legends pro players.
Olaf often accumulates much more CS compared to Master Yi. Champions who typically don't get many minion kills often don't require much CS to be valuable teammates, such as sup champs. These kinds of champions are able to scale well off of their skills, stats, and first items alone. Yet, champions with large amounts of CS, such as hyper-carries, usually require a lot of items to be effective. In either situation, try to do better than the values reported here to do well.
The most important items to use in your Olaf versus Master Yi build consist of Experimental Hexplate, Ravenous Hydra, and Death's Dance. When Olaf bought at least these three items in his build, he performed much better against Master Yi than with most other common item sets. In fact, Olaf had an average winrate of 46.9% battling Master Yi with this counter build.
To have the greatest chance of crushing Master Yi as Olaf, you should take the Conqueror, Triumph, Legend: Alacrity, Last Stand, Approach Velocity, and Biscuit Delivery runes from the Precision and Inspiration rune sets. Out of all the rune combinations players picked for Olaf vs Master Yi LoL games, this sequence of runes resulted in the highest win rate. In fact, these runes gave a 46.9% winrate overall.
By default, tips, statistics, and builds on how to beat Master Yi as Olaf are displayed for all ranked divisions combined. To filter the stats and builds to a specific division, you can use the selection menu earlier in the counter matchup guide.