Ahri vs Locke

Land Charm (E) before your combo: it's your only CC, and a target walking toward you takes Orb of Deception (Q) both ways.

Position so Orb of Deception (Q) hits on the way out and on the way back: the return deals true damage.

To stay in lane, clear the wave with Orb of Deception (Q): Essence Theft (passive) heals you every 9 minions or monsters killed, and more after a takedown.

Engage with Spirit Rush (R) but save a dash to get out: you can cast it up to 3 times, and each takedown gives you another.

Push your wave with Orb of Deception (Q), then roam: the dashes of Spirit Rush (R) get you there fast and back out just as fast.

Back instead of staying in lane at low health: Silver Stake (passive) adds damage to his autos that grows with your missing health.

Trade after Ashen Pursuit (E): it's his only instant movement, and its 10-second cooldown only resets if he gets a takedown.

During Soul Ignition (W), only hit him if you can kill him: at the end, he heals back part of the last damage taken, yours included.

Marked by Purgatory (R), stay above its threshold: if you have a heal or a shield, use it, because he seals marked enemies who drop below it.

If the Purgatory (R) artifact lands, hold the area where it fell: by picking it up, Locke raises his execute threshold for each sealed champion, for the rest of the game.