One of MMA's most dominant women challenged YouTubers and boxers to step into the cage after her latest win

• American fighter Kayla Harrison battered yet another opponent Thursday on ESPN.
• Harrison returned to the Professional Fighters League in style with a first-round finish.
• After scooping six points in the regular season, Harrison cut a highlight-reel promo.

One of MMA's most dominant women challenged YouTubers and boxers to step into the cage with her after her latest win.

Professional Fighters League champion Kayla Harrison returned to the combat arena Thursday for the league's latest behind-closed-doors event at the Ocean Casino Resort in Atlantic City, battering yet another opponent.

Harrison advanced her pro MMA record to nine wins (four knockouts, three submissions, and two decisions), with her first-round knockout win over Mariana Morais.

The win came after one minute and 23 seconds, as Harrison showed Morais who was boss as she tripped her opponent to the ground within 45 seconds, and then wailed punches down on her from full mount.

Watch Harrison's merciless finish right here:

-PFL (@PFLMMA) May 7, 2021

The 30-year-old American, a two-time Olympic gold medalist in judo, then delivered a highlight-reel promo in which she challenged the sport's supposed pretenders - from YouTubers to boxers - to fight for real in an MMA match.

"This isn't a tournament. It's a coronation, and I'm the queen, okay?" Harrison said.

"I'm not one to talk a lot of crap. But it seems like everyone from boxers to YouTube idiots seem like they can get in there.

"But from now on, I'm the baddest woman in this room, or any room."

-ESPN MMA (@espnmma) May 7, 2021

The PFL returns on June 10 with PFL 4, the fourth of its events in 2021. The event will be held at Ocean Casino Resort and broadcast on ESPN.

Olympic gold medal-winning boxer Claressa Shields makes her MMA debut against Brittney Elkin in a non-league fight during the show, while male lightweight and featherweight bouts are also expected.