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Why Blachowicz's striking poses problems for Souza

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Blachowicz stuns Rockhold at end of Round 1 (0:23)

Jan Blachowicz throws a kick that grazes the head of Luke Rockhold at the end of the first round. For more UFC, sign up here for ESPN+ http://plus.espn.com/ufc. (0:23)

Ronaldo "Jacare" Souza and Jan Blachowicz are set to meet in the main event of this weekend's UFC card in Sao Paulo, Brazil. Even though Souza is the more well-known and accomplished fighter, Blachowicz is the one coming into the light heavyweight fight with momentum.