Sivir's Boomerang Blade returns to her after reaching the max range, so you can shift position to hit enemies who would otherwise have evaded it.
Try saving Spell Shield for enemy abilities that can disable you such as stuns and roots.
Ricochet resets Sivir's basic attack timer on activation, so activating this immediately after landing a normal basic attack will maximize damage output.
Try to coordinate high-damage abilities with your allies right after Dr. Mundo uses his ultimate, but if you're unable to kill him quickly with burst he will heal through the damage.
Try casting Ignite when Dr. Mundo uses Sadism to negate a large portion of its healing.
The stats shown here clarify several strategic Sivir against Dr. Mundo counter stats that may help us realize the distinctions between the pair. As an example, Sivir’s KDA ratio ([kills + assists] / deaths) of NaN is more than Dr. Mundo’s KDA ratio of NaN, demonstrating that Sivir may be more central to her team's team fighting capability than Dr. Mundo..
Sivir often has a similar longest kill spree as her opponent does. Typically, she takes less damage than Dr. Mundo. This typically indicates differing health capacities, but it can also indicate that the champion with higher health has less agility and thus is not able to kite away from additional harm when engaged or poked.
Both League of Legends champions are great. Both champs have their strengths, weaknesses, and counters. In the game's current meta, Sivir usually loses when trying to fight Dr. Mundo, with a 47.9% win rate. Therefore, Sivir makes a bad counter for Dr. Mundo.
While Sivir does have a lower winrate than Dr. Mundo, when facing one another, Sivir also has a lower learning curve that makes her a less time consuming champion to learn and master. You should be very concerned when picking Sivir into Dr. Mundo.
Furthermore, Sivir has only a small amount of CC and other utility, a similar amount to Dr. Mundo. This often makes her just as valuable during teamfights, especially when trying to counter champions with a ton of burst damage.
While there is not a single best champion overall in League of Legends, in Sivir vs Dr. Mundo matchups, Dr. Mundo is the better champ with a lower win rate, less champion complexity, and a similar amount of utility to help out your allied champions during late stage team fights.
Sivir is a terribly counter for Dr. Mundo. You will do well by focussing your actions on maximizing your CS and taking out objectives. If you do that, you should be able to stand on your own as Sivir against Dr. Mundo.
If you would like to learn all of the intricacies of Sivir in order to counter Dr. Mundo during both the lane 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 tips displayed above, you should increase your win rate significantly and be that much closer to League of Legends pro players.
Sivir often racks up a similar amount of CS compared to Dr. Mundo. Champs who typically don't get much CS often don't need much CS to be effective, such as sup champs. They are able to scale properly off of their abilities and first items alone. Yet, champions with large amounts of CS, such as hyper-carries, typically need many items to be effective. In either situation, try to exceed the values shown on this page to do well.
The ideal items to prioritize in your Sivir versus Dr. Mundo build include Lord Dominik's Regards, Phantom Dancer, and Kraken Slayer. When Sivir incorporated at least these three pieces in her build, she performed significantly better when facing Dr. Mundo than with most other common item sets. In fact, Sivir boasted an average winrate of 47.9% battling Dr. Mundo with these items in her kit.
To have the best probability of vanquishing Dr. Mundo as Sivir, you should use the Lethal Tempo, Presence of Mind, Legend: Bloodline, Coup de Grace, Biscuit Delivery, and Magical Footwear runes from the Precision and Inspiration rune sets. Of all the runes players chose for Sivir vs Dr. Mundo battles, this composite of runes resulted in the highest win rate. Notably, these runes averaged a 47.9% winrate overall.
If you want to see Sivir x Dr. Mundo tips and builds for a a particular skill level, feel free to select one from the selection menu above. By default, the stats and guides displayed are computed using every match run with these champions.