Daniel Cormier is already one of the best fighters in the history of the UFC and the sport of MMA in general. On July 7, he wants to firmly etch his name into the conversation of who is the greatest of all-time.

The current Light Heavyweight champ will be moving up in weight to take on Heavyweight champ Stipe Miocic, who is arguably the best heavyweight in company history. It’s a rare champion vs. champion matchup for the UFC, and will give Cormier a chance to be just the fifth fighter to capture gold at two different weight classes and only the second to hold two belts simultaneously.

Cormier appeared on “The MMA Hour” with Ariel Helwani this week and made his case for being the GOAT if he beats Miocic this summer.

“I win this fight July 7, I’m the greatest fighter of all time,” Cormier said. “I’ve done something that was unheard of and that’s what I’ve always chased. I’ve always chased that. I chased it in the fights with (Jon) Jones because, even regardless of the belts, I would always say, ‘Once I beat Jones, I will be the greatest fighter of all time.’ So I believe that once I do this, something that was so crazy that no one even has attempted it, I feel like I’m in the conversation for the best fighter of all time.”

Cormier, now 38-year-old, has an impressive resume to back up his claims. He won the Strikeforce heavyweight grand prix with wins over Jeff Monson, Antonio Silva, and Josh Barnett. He beat Frank Mir and Roy Nelson at heavyweight before dropping down to 205-pounds and beating former Pride and UFC champ Dan Henderson. He’s taken on the very best the UFC has to offer at light heavweight and defended the belt three times so far. Other than controversial losses to Jon Jones (one that was overturned when Jones failed a PED test), Cormier remains undefeated.

“I’m trying to do something that’s unheard of. I know there’s been two-division champions, Randy Couture had the light heavyweight belt and the heavyweight belt, but he didn’t do it at the same time. Conor McGregor is the biggest star in mixed martial arts and he held two titles at one time and I’m about to actually do that, too. So he’s been on the cover of (the EA Sports UFC 3 video game) two years in a row, next year I go on the cover of EA Sports UFC.”

Cormier and Miocic will coach against each on the upcoming 27th season of The Ultimate Fighter before meeting in Las Vegas in July. It’s easily the biggest fight that either man could take right now, and the Champion vs. Champion billing should attract a lot of casual fan attention.

Cormier has also gone on record saying he plans to firmly retire by March 20, 2019. That means he only has two or three fights left in his career, so he might as well chase glory.