New UFC card and main event announced w/Strikeforce vs. UFC

The latest Strikeforce vs. UFC match was announced with Gegard Mousasi making his UFC debut against Alexander Gustafsson on 4/6 in Stockholm, Sweden.  It will be UFC's second show in Stockholm after a first day sellout on the first one.

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Who would you have the most interest in for Fabricio Werdum's next title defense?