The 24 fighters participating on the Bellator 131: Tito vs. Bonnar fight card officially weighed in on Friday in San Diego.  Former UFC light heavyweight titleholder Tito Ortiz takes on Stephan Bonnar in a grudge match in the main event. “I talked an awful lot of smack, not it’s time to back it up,” said Bonnar after making weight.  “I’m going to put on a show.