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.
Dodging Arctic Assault and Glacial Prison can give you a huge advantage.
Focus on avoiding the second swing of Winter's Wrath which carries the brunt of the damage.
Melee enemies can also stack Frost for Sejuani, be very careful around them.
The stats provided here underscore several influential Olaf vs. Sejuani counter statistics that can help us explain the differences and similarities between the two. Olaf’s KDA ratio ([kills + assists] / deaths) of NaN is more than Sejuani’s KDA ratio of NaN, showing that Olaf may be more central to his team's team fighting effectiveness than Sejuani..
Olaf usually has a slightly larger longest killing spree than his opponent does. On average, he receives a similar amount of damage to Sejuani. This often reflects differing health capacities, but it can also hint that the one champion has less agility and thus is unable to kite away from further damage when engaged or poked.
Both LoL champions are great. Both have their pros and cons. In League's current meta, Olaf usually wins when playing against Sejuani, with a 54.4% win rate. Therefore, Olaf makes a great counter for Sejuani.
While Olaf does have a much higher win rate compared to Sejuani, when they face off with one another, Olaf also has a lower learning curve that makes him a less challenging champion to learn. You should be be fine when picking Olaf into Sejuani.
Additionally, Olaf has almost no amount of utility and CC, a similar amount to Sejuani. This makes her just as valuable during teamfights, especially when facing champions with a ton of burst damage.
While there isn't a single best champion overall in League of Legends, in Olaf vs Sejuani matchups, Olaf is the better champion with a noticably higher win rate, less champion complexity, and a similar amount of utility to help out your allies during team fights.
Olaf is a great counter to Sejuani. Focus your actions on maximizing your gold and cs and taking out objectives. If you can do that, you should be able to stand on your own as Olaf against Sejuani.
If you would like to truly master Olaf in order to counter Sejuani during both the lane and mid / late game phases of League of Legends, you should keep reading to learn a few extra lessons on this matchup. If you mind the build and tips presented here, you should grow your win rate significantly and be closer to League of Legends pro players.
Olaf most often accumulates much more CS as Sejuani. Champions who on average don't acquire much CS usualy don't need much CS to be effective, such as sup champs. These kinds of champions are capable of scaling well off of their abilities and first items alone. Yet, champions with large amounts of CS, such as hyper-carries, typically require many items to be effective. In either case, try to do better than the values displayed here to do well.
The top items to have in your Olaf versus Sejuani build include Sterak's Gage, Experimental Hexplate, and Ravenous Hydra. When Olaf included at least these three items in his build, he did a lot better when fighting Sejuani than with many other common builds. In fact, Olaf had an average winrate of 54.4% battling Sejuani with this counter build.
To have the greatest probability of vanquishing Sejuani as Olaf, Olaf players 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 runes players used for Olaf vs Sejuani clashes, this order of runes resulted in the best win rate. In fact, these runes provided a 54.4% winrate overall.
By default, tips, stats, and builds on how to beat Sejuani as Olaf are shown for all skill levels combined. If you want to narrow the statistics and builds to a distinct skill level, you should use the selection menu located earlier in the counter matchup guide.