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.
Rengar's passive enables him to leap out of brush, so avoid fighting him when near bushes.
Rengar puts an indicator over the nearest enemy champion when he is camouflaged during his ultimate.
Rengar gains an empowered ability when his resource bar is full. Try to confront him when it's low.
The stats shown here show several strategic Sivir versus Rengar counter stats that can help you distinguish the differences and similarities between these two champs. As an example, Sivir’s KDA ratio ([kills + assists] / deaths) of NaN is better than Rengar’s ratio of NaN, showing that Sivir may be more central to her team's team fighting potential than Rengar..
Sivir typically has a slightly smaller longest kill spree than her enemy does. Typically, she receives less damage than Rengar. This is usually reflective of different amounts of tankyness, but it can also hint that the champion with increased health has less agility and thus is not able to kite away from additional damage when poked or engaged.
Both League champs are great champions. Both have their strengths, weaknesses, and counters. In League's current meta, Sivir usually loses when trying to fight Rengar, with a 47.3% win rate. Therefore, Sivir makes a bad counter to Rengar.
While Sivir does have a lower winrate than Rengar, when facing one another, Sivir also has a much lower level of difficulty that makes her a less challenging character to pick up and master. You should expect to face a difficult match when picking Sivir into Rengar.
Additionally, Sivir also has almost no amount of CC and other utility, a similar amount to Rengar. This makes her just as valuable during team fights, especially when facing champions with a lot of burst damage.
While there isn't a single best champion overall in League of Legends, in Sivir vs Rengar matchups, Rengar is the better champion with a lower win rate, less champion complexity, and a similar amount of utility to help out your team members during team fights.
Sivir is a garbage counter to Rengar. You will do well by focussing your strategy on increasing your CS and clearing objectives. If you do that, you should do very well as Sivir against Rengar.
To learn all of the intricacies of Sivir to counter Rengar during both the laning and mid / late game phases of League of Legends, you should keep reading to pick up a few extra lessons on this matchup. If you pay attention to the build and tips presented above, you will grow your win rate significantly and be closer to League of Legends pro players.
Sivir most often racks up much more CS as Rengar. Champs who typically don't acquire much CS usualy don't require much CS to be valuable teammates, such as support champions. These kinds of champions are able to scale well off of their abilities and first items alone. Yet, champs with large amounts of CS, such as hyper-carries, usually need many items to be effective. In either case, try to surpass the values reported here to do well.
The best items to use in your Sivir versus Rengar build include Lord Dominik's Regards, Bloodthirster, and Kraken Slayer. When Sivir used at least these three pieces in her build, she did a lot better versus Rengar than with most other commonly used builds. In fact, Sivir had an average winrate of 47.3% battling Rengar with this build.
To have the greatest likelihood of defeating Rengar as Sivir, you should take the Lethal Tempo, Presence of Mind, Legend: Bloodline, Coup de Grace, Absolute Focus, and Gathering Storm runes from the Precision and Sorcery rune sets. Of all the runes players used for Sivir vs Rengar counters, this mixture of runes yielded the greatest win rate. In fact, these runes averaged a 47.3% win rate overall.
By default, tips, stats, and builds on how to beat Rengar as Sivir are given for all ranked divisions combined. If you would like to scope the statistics and builds to an individual player tier, you can use the selection menu earlier in the counter matchup guide.