Clarke (9-1) made his Octagon debut opposite John Cholish at UFC 140: "Jones vs. Machida" last December, getting pounded out in the second round to snap his undefeated streak of eight consecutive fights. Kuivanen (16-5) didn't fare much better in his UFC debut, falling to John Sala via unanimous decision back in February.
Which one of these talented lightweights gets back into the win column on fight night?
UFC 149 is expected to feature a main event that includes featherweight Champion Jose Aldo against a soon-to-be-announced opponent. Match-ups of Court McGee vs. Nick Ring and Bryan Caraway vs. Mitch Gagnon have also been confirmed.
For more on the promotion's Calgary debut check out our complete UFC 149 event archive right here.