"I've had some major surgeries but I took the fights anyway, and I've shown that I'm able to compete. A lot of athletes don't compete with injuries, but I have. Those fights with Forrest were tight, and a completion of the trilogy should be the right way to end my career.
"It's my decision, I want to leave on my own terms. I haven't been injured badly, I've got my head on my shoulders, I agreed the fight and I go out on my terms."
However, Ortiz has not completely shut the door on a UFC extension. The American admits a big win could tempt him to fight on, although a move into the WWE - where Brock Lesnar recently returned - also appeals.
"I may have another one... you never know," Ortiz said of extending his UFC stay. "But I've got a lot of options. I've seen Brock Lesnar go back to the WWE, that's something I may entertain, do some 'theatrical entertainment' as they call it.
"I've got my clothing company, my supplement line Punishment Nutrition, it's business to me. I'm not going to be able to fight for the rest of my life and I want to leave on my terms."
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