Kayla Harrison Opens Up On UFC Deal, Fight Vs. Holly Holm, Amanda Nunes

Kayla Harrison's opening up on all things UFC ... from her practice runs making 135 lbs. in the lead-up to her huge scrap with Holly Holm to whether she still has an interest in meeting Amanda Nunes in an Octagon!

33-year-old Harrison chopped it up with TMZ Sports ... weeks after she rocked the MMA world, moving from PFL to Dana White's promotion.

The 2x Olympic gold medalist and 2x PFL champion will fight 42-year-old Holm on the stacked UFC 300 card on April 13. We asked Kayla about signing with the UFC, and her thoughts on her legendary opponent.

"It's been amazing. Honestly, my life is so good. I really do feel like everything is happening at the right time and the right place with the right people," Harrison said.

"To be going to the Olympics of MMA on UFC 300 against Holly Holm, a legend in the sport. I'm so excited, I'm so amped. This is the s**t that gets me going, and yeah, I'm ready!"

When UFC 300 rolls around, it won't be happening at 145 or 155 lbs. ... no, Harrison is fighting at bantamweight. We asked her if she fears being able to make the weight.

"Listen there's this giant misconception about my weight, and I think people think I walk around at like 180 lbs. or something. The reality is I was fighting at 155 lbs. and I was walking into the cage at maybe 160 lbs. I don't get much bigger than 160."

Kayla continued ... "I was always the smaller fighter and usually the less experienced fighter. I don't believe in weight cutting, but now I'm going to do what everybody does and I'm gonna be in the cage and I'm gonna be the bigger, faster, stronger and more experienced fighter."

"Is it gonna suck? Yeah. I'm not gonna enjoy dieting, but it's a chosen sacrifice."

Harrison has long said she wants to be the G.O.A.T. ... a title Amanda Nunes currently lays claim to. We asked KH if she still has visions of fighting Nunes in the future.

"Listen, Amanda is the greatest of all time. That's a fact. So, of course, I would love for that to happen," Kayla told us.

"I've always said that, and not out of a place of disrespect. To me thats the highest compliment I could give her. you're the best, I want to find out what I'm made of with you.t a lot to prove. I've got a lot to do. I've got my work boots on. I'm in the gym, I'm hungry, I'm staying humble, but of course!"

"I've always said that, and not out of a place of disrespect. To me thats the highest compliment I could give her. you're the best, I want to find out what I'm made of with you."

The Lioness is still technically retired ... though it sounds like she could be gearing up for a comeback.

Retired or not, first things first ... Holly Holm, and Kayla has her hands full.