Master Yi

basically counters everything you do he can q when you w and w when you ult and he out damage and sustain
best thing to do is to counter him in team fight since you can insta knock him up with your w if he q

Fiora

same as master yi just avoid her and you will perfrom more then her in team fights

Vayne

my perma ban champ you don't stand a chance against her best way is to ask for help and cc chain her to death

Olaf

never try to face him in early and mid game try to play safe give up some farm if he invades ask for help or try to ward your jungle and invade his jungle whenever he does late game he is just a walking healing pool for you

Shaco

Lee Sin

Rengar

this guy is just not fun to play against
i put him in major cause you can beat him if you have a bit of small lead

Jax

you both have weak early and strong late but you will out duel him in late game make sure you land your w for cc cause for seconds jax put high amount of damage and kayn suffers from stacking conq so every ability must hit if you wanna win this fight

Tryndamere

easy match up buy RO and ninja tabi
and this fight is easy win when he ults wait abit then ult since his ult lasts longer then yours and after you come out of your ult knock him up and then his ult should be ended and then free gold

Dr. Mundo

tho he is a tank but he does insane amount of damage you will never win this fight till you get mortel reminder
don't underestimate even in late game