Who can 1v1 Yi at 20+ minutes?
Just curious as to who can 1v1 Yi when he has

Just curious as to who can 1v1 Yi when he has

Depends on if he's fed or not.
If we're speaking about if they're the same level, typically 3 items done is around lv14.
If we're talking about duking it out, there are few champions that can actually do it. Kayle being one of them if she has 3 items on her. Riven can if she plays correctly. Nasus can but depends on stack count. Fizz can also depending on ultimate's range. Heimerdinger can also do it because the Yi has no resistances lol, just bait Q so you E and he gets shredded by R+Q > W.
Things like Lux just need to snipe him and he's dead since that's glass cannon lol. Other champions obviously can do the same thing without even having to come near him.
Scare him
when Yi is in ult, he will run so far away :D
I love when that happens.
Literally any burst mage.
An equally fed top lane fighter like jax, garen, tryndamere, fiora.
Probably others.
jax
Multi season Yi main with a positive winrate in diamond and a good educational youtube series. Of anyone would be able to answer you it's this guy.
If he completed those items at the 20 minute mark, then he's probably pretty fed so likely nobody.

Syndra, Veigar, and Orianna can't. I don't know about the others, but those can not since they're squishy, Yi can get close to them and Q their dangerous skillshots.
Veigar can if he gets the CC and hits Yi with a full combo. I don't play Syndra but if she hits the stun on a Yi who doesn't have any MR I would imagine it would pop him too.
Veigar can if he gets the CC and hits Yi with a full combo. I don't play Syndra but if she hits the stun on a Yi who doesn't have any MR I would imagine it would pop him too.
While yi is ulting it's going to be extremely hard to hit a syndra stun.
You just do it point blank. You don't have to hit them with the orb to stun them anyway if they are inside the push range and the ball is lined up with them.
Even if he doesn't Q the stun, he can always Q the ult which is her only real way of finishing him off. Syndra's ult doesn't finish while he's stunned.
Syndra's stun is more than long enough for her to ult ignite a target and walk away. Also don't forget that the stun will also knock them back to the max push range, and syndra doesn't need to stop moving to cast any of her spells, so will have gained a considerable distance from yi by the time he comes out of stun - and he will realistically need to meditate the instant the stun ends to survive (if that's even possible) if there isn;t a minion or something around to q. That just adds to the the distance yi needs to cross to catch syndra again, whose cooldowns will have time to refresh and given her range advantage yi will be eating a few more hits as he closes the gap again with his q already possibly spent.
They just walk away towards safety until yi either uses q to gapclose or gets into range where he stars autoing. If he q's in they wait and cc him after and he dies instantly. If he never q's and just starts autoing in becomes a mind game where the mage has to guess when hes going to q, and this favors the mage since yi can't react to point blank spells so it's purely a guess and he knows that if he qs too early he's dead, but if he doesn't q and just eats the full combo he also dies. He can choose to meditate to try and bait out some spells but if they don't bite then he just loses more distance.
[{quoted}](name=The Sword Saint,realm=NA,application-id=3ErqAdtq,discussion-id=onoM2oLI,comment-id=000300000001,timestamp=2017-03-30T14:11:44.827+0000)
They just walk away towards safety until yi either uses q to gapclose or gets into range where he stars autoing. If he q's in they wait and cc him after and he dies instantly. If he never q's and just starts autoing in becomes a mind game where the mage has to guess when hes going to q, and this favors the mage since yi can't react to point blank spells so it's purely a guess and he knows that if he qs too early he's dead, but if he doesn't q and just eats the full combo he also dies. He can choose to meditate to try and bait out some spells but if they don't bite then he just loses more distance.
Keep in mind Yi is basically 3 shotting them.
He really isn't. It's going to take him a few seconds against any similarly leveled and farmed enemy - this isn't 6 item infinity edge mastery yi we're talking about. He also isn't ccing his targets, but he WILL be cc'd and thus stop autoing if he just runs on on a mage on equal gold. Then he will die before being able to continue autoing. This is why yis don't just run straight up at people in teamfights or 1v1 unless they are very ahead and can survive the burst they will be tanking before they can kill their target.
Ahri would likely die. Lux would likely die. Syndra could win or lose. Brand will likely die. Kayle would likely win if played right.. WW could win or lose. Zyra could win or lose. Veigar could win or lose. Orianna would likely die. Rengar could win or lose. Katarina could win or lose.
Ahri would likely die. Lux would likely die. Syndra could win or lose. Brand will likely die. Kayle would likely win if played right.. WW could win or lose. Zyra could win or lose. Veigar could win or lose. Orianna would likely die. Rengar could win or lose. Katarina could win or lose.
They'd all die if they're shit or not equally fed. If they're competent and equally fed they'll win.
Jax
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[{quoted}](name=Linna Excel,realm=NA,application-id=3ErqAdtq,discussion-id=onoM2oLI,comment-id=0000,timestamp=2017-03-30T04:26:42.642+0000)
+
Okay?
lol good joke
Good duelists.
like...most of the 1v1 champions.
if he's not playing like a potato
I'd say at best chances are:

Tryndamere, Jax, Irelia, Warwick especially with that squishy ass build.
600+ stack nasus
[{quoted}](name=Grokmir the bold,realm=NA,application-id=3ErqAdtq,discussion-id=onoM2oLI,comment-id=000c,timestamp=2017-03-30T13:56:19.848+0000)
600+ stack nasus
Show me a nasus who can get 600 stacks at 20 mins every game and I will gift him Infernal Doggo. I was 7/1 in lane and had a bit under 500 stacks at 20 mins.
[{quoted}](name=le un le seul,realm=NA,application-id=3ErqAdtq,discussion-id=onoM2oLI,comment-id=000c0000,timestamp=2017-03-30T18:31:43.069+0000)
Show me a nasus who can get 600 stacks at 20 mins every game and I will gift him Infernal Doggo. I was 7/1 in lane and had a bit under 500 stacks at 20 mins.
Its actually not hard to do at all if the nasus gets ahead and focuses 100% on stacking. But most nasus's will switch their focus to either hard pushing with e or grouping at that point.
My personal best stack score was around 600 at 18 minutes.
Any nuker that lands their spells
tryndamere probably when he has ult, just bring another brain dead champion into the scene to face off with another.
Annie.
Trundle can usually do it