Vi vs Xin Zhao

Hit an enemy with a spell to activate Blast Shield (passive): it charges over time, and every third hit on a target lowers its cooldown.

Hit the same target three times: Denting Blows (W) adds damage based on their max health, removes some of their armor and gives you attack speed.

Cast Relentless Force (E) on a minion in front of your opponent: the shockwave also hits enemies behind the target, with full damage.

Charge Vault Breaker (Q) out of sight before you show up: fully charged, it deals double damage, and it stops on the first champion hit to knock them back.

Cast Cease and Desist (R) on their carry: you're unstoppable during the charge, and enemies in your way are stunned. Don't stray too far from your team.

Get out of the line of the Wind Becomes Lightning (W) thrust: it slows you and marks you as Challenged, which extends the range of Audacious Charge (E) on you.

If you have CC, use it during Three Talon Strike (Q): without his three autos, there's no knock-up, and his other cooldowns don't go down.

After Audacious Charge (E), keep your distance: it's his only dash to get back on you, and without it he has to walk up to you.

After Crescent Guard (R), don't hit him from range: for a moment, he ignores damage from outside the swept zone. Back off, or hit him from inside it.

If you survive his first minutes, play for time: Xin Zhao is strongest early on, through his ganks and skirmishes.