A few factors to get out of the way. The main being comparing this fight to the last time they fought. What's different this time than last time? Well, this time Tito Ortiz is coming in with some leg injuries and a back problem. Ken Shamrock is reportedly coming in healthy. The last fight Ortiz came in after recovering from ACL surgery, but had plenty of time to repair the injury. Shamrock claimed in the first fight that he fought on one leg, never getting it fixed before the fight due to what he saw as a risk of the fight being cancelled and never put back together again. The last fight was a five round bout for the Light Heavyweight title, but only lasted three rounds due to corner stoppage. This fight is scheduled for three rounds, non-title. Another factor is weight. Ken Shamrock came in the last fight having to make 205 lbs. While he still has to this time, he's not coming down from a fighting weight of Heavyweight. I'm not sure what his walk around weight is, surely 220 lbs. or more, but his last two fights were at or around the weight he'll be fighting this time. Age is against him, as he's 42 now, with Ortiz coming in at the prime fighting age of 31. Since the last fight, Ken Shamrock has beaten Kimo, another UFC legend who hasn't been competitive at the top level in quite a while, and lost to Rich Franklin and a past-his-prime smaller Kazushi Sakurba. Ortiz has faced the best competition of his entire career since the Shamrock fight, battling with Randy Couture, Chuck Liddell, Vitor Belfort, and Forrest Griffin, going the distance in three of the four and winning two of those. So that gets out of the way most of the excuses you might hear after the fight from either side.