This matchup is a scaling skirmisher versus a duelist splitpusher; Yone must manage trades to deny Fiora easy vital procs and avoid isolated duels.
Yone should avoid giving Fiora passive scaling by using controlled (E) + (Q) combos to pressure and force cooldowns without overcommitting.
Trading pattern
Stack (Q) to reach knockup, then use (E) and second (Q) to close gap and trade, snapping back with (E) to avoid (W) parry.
Punish (W) cooldown by engaging shortly after it expires for safer crowd control application.
Avoid trading when Fiora's vital is accessible and (W) is ready; force her to waste (W) before committing to all-ins.
Danger windows
Be cautious when (W) is available to parry your (E) or (Q) knockup; mistiming can lead to stuns and lethal trades.
Avoid overextending after using (E) as Fiora can predict your position once you snap back.
Watch for Fiora's level 6 (R) activation which can force long duels where she can chase and heal; disengage or hug terrain to minimize vital access.
Early game
Use level 3 power spike to trade with (E) + (Q) + (W) shield combo only when minion wave and spacing minimize Fiora's punish potential.
Avoid extended trades early before first item; focus on short trades with knockup threat to chip Fiora without exposing yourself.
Keep wave control to prevent Fiora from isolating you in long lanes where she excels.
Power spikes
At level 3, use (E) + (Q) + (W) combo to force trades with planned exit, leveraging shield and knockup.
After first attack speed item, increase wave pressure and trade confidence, but remain aware of (W) cooldown.
Respect Fiora's level 6 (R) spike that enables extended duels; avoid isolated fights when (R) is active.
Win conditions
Use (E) + (Q) combos to force Fiora's key cooldowns and punish when (W) is down to secure trades and lane control.
Deny Fiora isolated side-lane duels by maintaining wave presence and avoiding long lanes; force her into unfavorable fights.
Scale into mid-game with first attack speed item and (R) to engage teamfights or side-lane pressure, leveraging your knockup and shield to outplay Fiora's dueling.
Tip: For Yone vs Fiora, read overview, trading pattern, and danger windows first for a fast Top lane check.