[{quoted}](name=Zethera Densetsu,realm=NA,application-id=3ErqAdtq,discussion-id=LiKsgdfj,comment-id=000000000000000000000000,timestamp=2017-01-06T19:53:56.801+0000)
Thing is she always has the advantage of Riposte. She just has to wait out the Counter-Strike, then hit Riposte when it's about to end. If she at least gets the attack-speed slow off, Jax definitely cannot trade with her.
Post six he can't stand and fight her because her ultimate gives her so much extra damage plus the heal.
Reactivate Counter Strike earlier, then. Be unpredictable. Against a good Fiora you have a roughly .25 second window to stun her, based on when she Ripostes.
Riposte when she tries combo'ing you.
Don't try to fight her without your passive stacked at least partially - of course you're gonna lose if you're only using 3 abilities and she's using 3 and her passive.