Master Yi is always known as the non-viable champ in Ranked Games. I beg to differ. I usually "carry" in my games because No one suspects Yi, so I can take advantage of that and win the game.

The runes speak for themselves. Dodge for jungling and any AD carries. Magic Resist for counter junglers like Nunu. Health Quints for survivability. My masteries are 7/12/11 because I do not think 0/9/21 is good on Yi.

You should gank immediately after level 4. By then you should have Red Buff and be ready to go. Always buy wards. Also, you're thinking, why no Wriggle's Lantern? Well I never needed it so forget it. You can however get one instead of buying that extra Bloodthirster.

By now, you should be backdooring towers left and right. What they don't know is that you stopped jungling and are laning. This causes confusion for your opponents and because this is a psychological game, allows you to win.

What late game.

Master Yi is one of the best champions in the game. Although cannot do teamfights, Yi can backdoor, pick off, and cause confusion among the enemy.