What you should know about UFC 106

Updated: November 19, 2009, 3:27 PM ET
By ESPN Stats & Information

1. Tito Ortiz and Forrest Griffin meet in a rematch of an April 2006 slugfest won by Ortiz in a highly debated split decision. Originally slated to be the co-main event, this Ortiz-Griffin bout took top billing when UFC heavyweight champion Brock Lesnar was forced to withdraw due to illness.

2. Since winning the light heavyweight title in July 2008, Griffin is 0-2, suffering knockout losses to Rashad Evans and Anderson Silva. It is the first time in his career that Griffin has suffered back-to-back losses.

3. Ortiz returns to the UFC and fights for the first time in 18 months. One of the most popular fighters in UFC history, "The Huntington Beach Bad Boy" left the company when his contract expired in May 2008 but re-signed after multiple deals with other organizations fell through. He has not won a UFC bout since October 2006 (2-1), but will be making his 22nd appearance in the Octagon, tied with Chuck Liddell for the most ever.

4. Anthony Johnson fights for the second time in a month after knocking out Yoshiyuki Yoshida in 21 seconds on Oct. 24 (although he missed the 170 welterweight limit by six pounds). Johnson has won three straight fights, and all five of his UFC wins have come by knockout (four in the first round). Josh Koscheck's last three fights have ended in first-round knockouts (2-1).

5. UFC 106 has undergone a number of changes from its original plan. Lesnar's title bout with Shane Carwin was scrapped, and Griffin is filling in on short notice to replace the injured Mark Coleman. Koscheck-Johnson was a late addition, helping add a fight to the card after Lesnar was ruled out.