Ekko vs Talon

Throw Timewinder (Q) at a champion, then position so the device passes through them again on its way back: it expands into a slowing field, and the return hits again.

Hit with Timewinder (Q) out and back, and weave in the empowered auto from Phase Dive (E): the third hit triggers Z-Drive Resonance (passive), with bonus damage and speed.

Cast Parallel Convergence (W) where the fight will happen, then step into the sphere when it appears: you stun the enemies inside and gain a shield.

Engage, deal your damage, then cast Chronobreak (R): you return to where you were 4 seconds earlier, in stasis, and recover health based on what you lost.

Get out of the path of Rake (W), especially on the return: the returning blades slow you, and each spell that hits brings you closer to Blade's End (passive).

Push your wave whenever you can: he then has to stay and farm instead of roaming by vaulting walls with Assassin's Path (E).

If you can engage, go for him while Shadow Assault (R) is on cooldown: it's his main way out of a fight, and it comes back in 100 to 60 seconds.

Ping your team as soon as he leaves your vision, and ward the paths behind walls: Assassin's Path (E) lets him vault walls to roam through the jungle.