The 33-year-old Siver (21-8) recently made the drop to 145 pounds, making his featherweight debut with an April unanimous decision win over Diego Nunes. He returned to action at this past weekend's UFC on Fox 5 show, putting on a great performance in a unanimous decision victory over Nam Phan. A UFC fighter since April 2007, Siver is 6-1 in his last seven fights.
The 29-year-old Swanson (18-5) has been on a career resurgence since joining the UFC following a run in the WEC where the once 11-1 fighter became a win one, lose one fighter. Following a defeat to Ricardo Lamas in his Octagon debut, Swanson ripped through three straight wins in 2012 with stoppages in all of them.
He began the year in January with a second round TKO win over George Roop and followed that up with a second round TKO win over Ross Pearson. Then in September, he knocked out Charles Oliveira in just 2:40 of the first round to earn his second straight Knockout of the Night bonus.