Conor McGregor accomplished something no fighter in a decade has on Saturday night at UFC 205 when he knocked out Eddie Alvarez with a second-round flurry to become the first foe to stop Alvarez with strikes since the early stages of Alvarez's well-traveled career.

The historic win at Madison Square Garden also made McGregor the only two-division champion to ever reign in the UFC, and afterward Alvarez was left to reconcile forever being on the wrong side of MMA history.

"I'm disappointed," Alvarez said on FOX Sports 1. "I didn't fight a good fight. I think I went in with a plan, I didn't stick to the plan and I think I paid for it."

Alvarez, 32, vowed to expose McGregor in the lead-up to UFC 205, but ultimately suffered the same fate as many of the Irishman's past opponent.

McGregor knocked Alvarez down three times in the opening round with hard strikes, then finished Alvarez for good in the second frame courtesy of a highlight-reel four-punch combination from the reigning UFC featherweight champion.

Alvarez admitted afterward that his gameplan was to kick and wrestle with McGregor, but that his plan quickly went by the wayside once the fight began.

"I kinda got lulled a bit into his game and paid for it," Alvarez said.

"I think it was just kinda relaxed and I was just kinda like, ‘alright, it's going to be relaxed, we'll do it that way.' I almost got lulled into his pace and got out of my own pace. He did a good job, hats off to him."

With the win, McGregor not only accomplished a feat previously unseen in the Octagon by becoming a two-division champion, but he also fulfilled a goal of first established by himself when he signed with the UFC in 2013.

In doing so, "The Notorious" proved once again that the same ferocious punching power that earned him the featherweight strap will successfully translate to the upper weight divisions, and for Alvarez, that lesson came the hard way.

"The shot he hit me with (in the first round), I think I threw a shot and he came over the top, because I don't even remember it really," Alvarez admitted. "I just remember being on the floor and I was like, 'wow, that was quick. Whatever that was, it was fast.' And I didn't feel like it hurt me crazy. It was kind of a flash, and I've been there before, so I was okay with it.

"But I just boxed too much. I just boxed too much tonight, too much boxing."