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Your vision score is 0.91 per minute; Master players average 1.20. Buy a control ward on every recall (75 gold is the cheapest insurance in the game), use your trinket off cooldown and sweep the river before objectives.
You take part in 51% of your team's kills; Master players average 60%. After your first item, look to rotate for dragon, grubs and herald, and keep Teleport for fights rather than for farming.
Master Yi: 12 wins in 17 games (71%). When you need LP, this is the pick — climbing is easier on a champion you win with than on a "stronger" one you don't.
