Make sure you choose the right augment at the right time.
Death Ray is a powerful poke and a strong area of denial tool. Use it in combination with Gravity Field to control your enemy's position.
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 provided here clarify several strategic Viktor vs. Master Yi counter statistics that may help you appreciate the distinctions between the pair. For instance, Viktor’s KDA ratio ([kills + assists] / deaths) of NaN is better than Master Yi’s KDA ratio of NaN, showing that Viktor may be more central to his team's team fighting capability than Master Yi..
Viktor normally has a slightly smaller longest killing spree than his counter does. Typically, he receives less damage than Master Yi. This commonly reflects different amounts of tankyness, but it can also imply that the one champ has less mobility and thus is not able to kite away from further damage when poked or engaged.
Both LoL champions are great. Both champs have their pros and cons. In League's current meta, Viktor usually fairs equally well when playing against Master Yi, with a 50.1% win rate. Thus, Viktor makes an ok counter for Master Yi.
While Viktor does have a higher win rate than Master Yi, when facing one another, Viktor also has a much greater level of difficulty that makes him a more challenging champion to develop with. You still need to be cautious when picking Viktor into Master Yias his relative depth means that you may not be able to reach his full potential without a significant amount of practice beforehand.
Moreover, Viktor has almost no amount of utility and CC, 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 is not a single best champion in League of Legends, in Viktor vs Master Yi matchups, Viktor is the better champion with a similar win rate, more champion depth, and a similar amount of utility to help out your teammates during late stage team fights.
Viktor is a decent counter to Master Yi. You will do well by focussing your gameplay on keeping up your gold income and clearing objectives. If you are able to do that, you should do very well as Viktor against Master Yi.
To truly master Viktor to counter Master Yi 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 listen to the build and stats shown here, you will grow your win rate significantly and be that much closer to League of Legends pro players.
Viktor on average racks up much more CS relative to Master Yi. Champions who on average don't acquire many minion kills usualy don't require much CS to be valuable teammates, 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, typically have to have several high cost items to be effective. In either situation, try to surpass the values reported here to do well.
The top items to have in your Viktor versus Master Yi build include Rabadon's Deathcap, Shadowflame, and Stormsurge. When Viktor incorporated at least these three pieces in his build, he did significantly better countering Master Yi than with many other commonly used counter builds. In fact, Viktor had an average win rate of 50.1% when countering Master Yi with this counter build.
To have the best probability of beating Master Yi as Viktor, you should use the First Strike, Magical Footwear, Biscuit Delivery, Cosmic Insight, Manaflow Band, and Transcendence runes from the Inspiration and Sorcery rune sets. Of all the rune combinations players picked for Viktor vs Master Yi LoL games, this sequence of runes resulted in the highest win rate. Moreover, these runes averaged a 50.1% winrate overall.
By default, tips, statistics, and builds on how to beat Master Yi as Viktor are shown for all ranked divisions combined. To scope the statistics and builds to a specific rank, you should use the selection menu located earlier on the page.