Disclaimer: I don't hate Fedor,i think he's one of the greatest fighters of all time.but the sport has evolved and there are few fighters that are bad matchups for Fedor.not saying they could beat fedor 100%.all of them have a chance of getting ko by fedor 1：Stipe Miocic lets be honest about fedor for a moment,fedor was not a good technical striker,hes a brawler that moves like a welterweight.that what made him successful in hw back then.fedor always throw wild punch and hooks.it work for him against not average strikers like most of his opponent but that won't work against someone like stipe and would get himself ko'd because stipe technical boxing is much better than fedor. fedor style works great against fighters that are not a high-level striker like, big nog, Randleman, and Fujita but he would get absolutely countered by high level boxer/striker like stipe.the Arlovski-fedor fight shows that Fedor style was very vulnerable to countering and Arlovski technical striking is not even remotely close to stipe level. (4 gifs in 1 gif) and stipe is really good at countering.hooks,straight punches.one good counter punch would put fedor to sleep. even in the cro cop-fedor fight show that fedor was vulnerable to counter, especially straight punch which is stipe best and most powerful strike.stipe jab/straight punch is way more powerful and more precise than cro cop one (2 gifs in 1 gif) 2: Prime JDS: this one is easier than other 2 because jds physical attributes surpass Fedor(fedor main weapon) and his technical boxing is better than fedor.jds can match fedor speed,hit harder(ko werdum,cain with a single punch), and more athletic.jds also got better footwork,in and out movement(one of the factor in this fight), and more variety on feet.if Fujita was able to hurt fedor then jds can definitely ko him. 3：Techreem aka economicalreem this one is controversial due to Overeem chin but i think this is probably the worst matchup for Fedor because overeem is much more skilled than fedor in every area.fedor is a brawler(sometimes technical) with little to no footwork.overeem technical striking is even better than stipe miocic, especially counter striking.fedor hope of catching Overeem on feet is lower than jds who got tool'd by overeem.fedor wild style would easily get countered by overeem. and this wont be just a boxing match,overeem would throw leg kicks,body kicks and other types of kicks ,other than the cro cop fight where fedor check 1 leg kick.fedor has shown to be affected by leg kick as shown in the big nog-fedor 3 fight and the Arlovski fight 4: incoming typical replies : "Fedor outstruck and beat cro cop on feet" Cro cop is not a great striker if you compare him to today elite strikers.cro cop got little to no footwork and his strategy is/was too obvious.cro cop was good against stationary fighter and always has a problem with pressure fighter "Fedor was out of his prime when he fought arlovski" Fedor was 31 or 32 years old when he fought arlovski.theres no evidence of him declining at that time.you can make a argument that he's not in his prime anymore after the werdum fight but not when he fought arlovski,and not in your physical prime shouldn't affect your skills.