UFC matchmaker Joe Silva is pulling out all the stops for the promotion’s upcoming event in Anaheim, California on October 23. UFC 121 is tentatively scheduled to have a headlining fight between heavyweight champ Brock Lesnar and contender Cain Velasquez but an excellent supporting cast has been forming over the past couple weeks.

News comes today by way of MMAFighting.com that former light heavyweight champ Tito Ortiz will face Matt Hamill in a main card fight while Sportsnet.ca says rising heavyweight star Brendan Schaub is now set to battle Gabriel Gonzaga.

With such a strong line-up forming quickly in addition to massive drawing power of Brock Lesnar, this event could be the biggest of the second half of 2010. The full, rumored card is:

Brock Lesnar vs. Cain Velasquez

Jake Shields vs. Martin Kampmann

Tito Ortiz vs. Matt Hamill

Diego Sanchez vs. Paulo Thiago

Brendan Schaub vs. Gabriel Gonzaga

Court McGee vs. Ryan Jensen

Chris Camozzi vs. Dongi Yang

Sam Stout vs. Paul Taylor

Patrick Cote vs. Tom Lawlor

Sources: MMAFighting - Sportsnet