Not Updated For Current Season
The masteries shown here are not yet updated for the current season, the guide author needs to set up the new masteries. As such, they will be different than the masteries you see in-game.
Sivir is one of the most harassing characters i have ever played when it came to attack speed, And Sivir is all about attack speed and armor penetration. Please read this description accordingly. My win to loss with Sivir is 9 - 4 I don't know if thats normal for most but i have a really bad habit of getting even wins to losses. Sivir has yet to disappoint.
Early Game: Around levels 1-8 You need to do your best With harassing just with Ricochet, only use Boomerang Blade to either push them back a little farther, or to get that killing blow (depending if your laning with someone else or going mid). If you against Say Blitzkrank or and other players using Taunting characters, keep your distance.
Mid Game: This is when people begin to mostly switch lanes and Begin massing other lanes. Use your skill On The Hunt Wisely.... Chances are the other team will be ****s and try to pull one of your allies in.... believe it or not you going to be the starter with Boomerang Blade. After you use On The Hunt. It will be a game changer believe it or not.
End Game: You are Officially most likely that scariest player on the map take it to your advantage. Armor Pen an Amazing speed of 2.1-2.5 and Life steal to keep you going in any situation.
This goes for Solo lane or lane with someone else.
Have fun guys hope the build works for you like it did me.