Former world boxing champion Roy Jones Jr. steps foot inside the ring for the final time Thursday night, meeting Scott Sigmon live on UFC Fight Pass from his home in Florida.

The bout is for the vacant WBU cruiserweight championship, a title Jones previously held. He captured the vacant WBF cruiserweight belt with a TKO finish of Bobby Gunn last February.

For Jones, this is just another in a long line of career-defining fights. Recently, he looked back at several of those matches:

Vs Bernard Hopkins, May 22, 1993, wins IBF middleweight title on points

“It was a good fight for my first world title. The thing about that fight was I just wanted to make sure I stayed smart and I stayed focused because one of the first goals in my life was to turn professional and become a world champion. I felt a lot of pressure on my back because this was what I’d worked so hard to do for all those years. I fought the fight with one hand due to injury, but I did what I needed to become world champion.”

Vs James Toney , Nov 18, 1994, wins IBF super-middleweight title on points

“I was already a world champion, but he was the boss. James Toney was The Man at that time, they were calling him the best pound-for-pound fighter in the world, and to be the man you have to beat The Man. I couldn’t just get a win, I had to dominate him and show the world that not only was he not the best pound-for-pound, but there was no-one else close to Roy Jones Junior. And that’s what happened. I annihilated the man, dominated him. That was my coming-out party, I showed all my weapons in that fight, I showed everyone, no, hey, this is what the best pound-for-pound fighter in the world really looks like!”

Vs Montel Griffin II, Aug 7, 1997, regains WBC light heavyweight title via first round KO

“Losing my undefeated record the way I did (on a controversial disqualification five months earlier) was really bad for me. Y’know, even though everybody who ever saw that thought it was wrong, my undefeated record was still gone. Done. They took my “and 0” away and there was no getting it back. So the second fight came and I made sure to prove who was the better fighter.

“It wasn’t personal. I don’t blame the guy, he didn’t decide to disqualify me for nothin’. It was a life lesson, that’s life. But I made sure nobody would ever think he was a better fighter than me in that rematch.”

Vs John Ruiz, March 1, 2003, wins WBA heavyweight title on points

“I wanted to be a world champion my whole life but I never once thought of the heavyweight title until it presented itself. This was something that God gave me, way and above more than I ever asked for or expected. It was the chance to make history, to do something nobody would dream of me doing.

“This was history, the first fighter to jump from middleweight to win the heavyweight title in over 100 years. John Ruiz had no clue what he was dealing with or what he was facing. He found out the hard way.”