Jonas vs. Mayer will be presented live on Saturday, January 20, at 2 p.m. ET/11 a.m. PT, exclusively in the U.S. on ESPN+. The event takes place at the M&S Bank Arena in Liverpool, England.

Having previously unified the WBC, WBO and IBF junior middleweight worldtitles, Jonas (14-2-1, 9 KOs) will be making the first defense of her welterweight crown, which she claimed after scoring an emphatic stoppage win over Canadian Kandi Wyatt last year.

Mayer (19-1, 5 KOs),a fellow Olympian and former IBF, WBO, and Ring Magazine junior lightweight world champion, moves up in weight once again as she attempts to become a two-division world champ.

In other streaming action on ESPN+, Jack Cullen (22-4-1, 10 KOs) returns to defend his British and Commonwealth super middleweight titles against former foe Zak Chelli (14-2-1, 7 KOs).