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.
Watch out for Corki's Missile Barrage. They deal splash damage, so you can get hit even when hiding behind minions.
Corki is vulnerable after he uses his Valkyrie or Special Delivery, so try switching focus to him if he uses them to enter a fight.
The stat comparisons shown on this page clarify some influential Sivir vs. Corki matchup stats that can help us understand the differences and similarities between the pair. As an example, Sivir’s KDA ratio ([kills + assists] / deaths) of NaN is better than Corki’s ratio of NaN, indicating that Sivir may be more central to her team's team fighting capability than Corki..
Sivir often has a slightly smaller longest kill spree than her enemy does. Commonly, she receives a similar amount of damage to Corki. This often reflects differing health capacities; however, it can also hint that the one champ has less agility and thus is unable to kite away from further damage when engaged or poked.
Both LoL champions are great. Both champs have their strengths, weaknesses, and counters. In the game's current meta, Sivir usually fairs equally well when facing off against Corki, with a 49.4% win rate. Thus, Sivir makes an ok counter for Corki.
While Sivir does have a lower win rate compared to Corki, when facing one another, Sivir also has a lower difficulty level that makes her a less difficult champion to learn. You still need to be cautious when picking Sivir into Corki.
Furthermore, Sivir has almost no amount of CC and other utility, a similar amount to Corki. This makes her just as valuable during teamfights, especially when fighting champions with a lot of burst damage.
While there is not one best champion for every situation in League of Legends, in Sivir vs Corki matchups, Corki is the better champ with a similar win rate, less champion complexity, and a similar amount of utility to help out your teammates during late stage team fights.
Sivir is a somewhat poor counter for Corki. You will do well by focussing your strategy on keeping up your gold income and clearing objectives. If you can do that, you should be able to stand on your own as Sivir against Corki.
To truly master Sivir in order to counter Corki during both the early game and mid / late game phases of League of Legends, you should continue reading to learn a few extra lessons on this matchup. If you listen to the build and stats presented above, you will grow your win rate significantly and be that much closer to League of Legends pro players.
Sivir on average racks up a similar amount of CS compared to Corki. Champs who typically don't earn much CS usualy don't need much CS to be valuable teammates, such as support champions. They are able to scale properly off of their abilities and first items alone. Yet, champs with a lot of CS, such as hyper-carries, typically have to have many items to be effective. In either case, try to surpass the numbers displayed on this page to do well.
The top items to prioritize in your Sivir versus Corki build include Lord Dominik's Regards, Kraken Slayer, and Navori Quickblades. When Sivir combined at least these three items in her build, she performed a lot better vs Corki than with many other commonly used builds. In fact, Sivir had an average winrate of 49.4% when playing against Corki with these items in her kit.
To have the best probability of defeating Corki 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 Corki counter picks, this mixture of runes resulted in the best win rate. In fact, these runes averaged a 49.4% winrate overall.
If you want to view Sivir x Corki tips and counter stats for a an individual skill level, please select one from the selection menu shown above. By default, the stats and build suggestions shown are computed using all rounds played with both champions.