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Junior dos Santos versus Alistair Overeem is one of the greatest matchups in MMA today. They're extremely similar in style—aggressive, heavy-handed strikers with knockout power that like to keep the fight standing.
However, based on Alistair's struggles against a grappler in Fabricio Werdum, Junior dos Santos seems to have the superior stand-up in several ways.
His boxing is more technical. Shown by his performance against Shane Carwin, Dos Santos effectively utilizes his jab and head movement to leave himself less susceptible to getting hit. While Alistair hasn't lost in 11 fights, his last loss was via knockout to Sergei Kharitonov. Overeem has lost via KO or TKO six times.
Junior's ability to keep the fight standing is also superior. He was able to take down a quality wrestler in Shane Carwin and while Werdum struggled to get Overeem to the ground, the fight only spent about eight minutes standing.
Finally, while they both defeated their common opponent in Werdum, the fight went very differently for both of them. Junior dos Santos knocked Werdum out at 1:21 of the first round. Overeem, on the other hand, did a decent job of avoiding the Brazilian Jiu-jitsu of Werdum, but still got beat up on the feet. While Werdum was considered to be completely out of his depth standing, he still landed more strikes throughout the bout—69 in comparison to Alistair's 48.