Bellator officials have yet to confirm the pairings or set a date for the tournament to kick off.
Last season's runner-up, the 32-year-old Vianna (12-2-1) hopes to rebound from a heart-breaking decision loss to Alexander Shlemenko, which snapped a five-fight streak that included tourney wins over Sam Alvey and Bryan Baker. He'll meet fellow Shlemenko victim Rogers (8-3), who looks to get back on track after ripping through seven straight first-round knockout victories before falling to the Russian.
Reverently nicknamed "The Arm Collector," Santana (17-1) storms into the field fresh from defeating Darryl Cobb via armbar in his Bellator debut to notch his 13th victory by the trademark submission. Meanwhile, the unbeaten Santos (12-0) makes his first appearance of the year after blazing through four victories in 2011.
Team Vision product O'Donnell (11-3) returns to action for the first time since suffering a disappointing first-round TKO loss to Rogers in Season Five's quarterfinals. He'll take on former M-1 light heavyweight champion Vasilevsky (15-1), who strides into the tournament on a 14-fight winning streak, having not tasted defeat since 2008.
A UFC veteran and winner of ten of his last 11 contests, Falcao (28-4) makes his Bellator debut after knocking out Douglas del Rio in just 65 seconds in October. Across the cage, 25-year-old Frenchman Paraisy (10-1-1) is unbeaten in six fights since receiving his Bellator pink slip in mid-2009, including a decision win over former WEC champion Paulo Filho.
The winner of Season Six's middleweight tournament receives a $100,000 grand prize and guaranteed title shot against the Bellator middleweight champion.