Tryndamere vs Olaf

Keep your Fury high before a trade: with Battle Fury (passive), it raises your critical strike chance. Spend it with Bloodlust (Q) when you need health.

Cast Mocking Shout (W) before a trade against a physical damage champion: it lowers their attack damage, and slows enemies who turn their back on you.

Count on Spinning Slash (E) to stick to your target or to escape: each critical strike lowers its cooldown, more so on a champion.

Wait until you're close to death to cast Undying Rage (R): you can't die during the effect, and delaying it pushes the enemy to take risks to kill you.

Split push in a distant lane to draw several enemies: Undying Rage (R) helps you hold them off while your team takes an objective.

Dodge Undertow (Q): it's his only slow, and without a dash, he can only reach you on foot.

Take a trade when his axe has landed far from him: until he picks it up, Undertow (Q) keeps its 9-second cooldown.

Avoid long trades when he's low on health: Berserker Rage (passive) gives him attack speed and life steal based on his missing health.

If you have CC, save it for after Ragnarok (R): while it lasts, no CC stops him, and it has a 100 to 80 second cooldown.