A pivotal women's flyweight bout is set for UFC 266.
Former strawweight champion Jessica Andrade will meet Cynthia Calvillo at the Sept. 25 pay-per-view event, sources told MMA Fighting's Mike Heck and Guilherme Cruz.
Andrade is coming off a second-round TKO loss to women's flyweight champ Valentina Shevchenko at UFC 261 in April. The 29-year-old is 1-1 at 125 pounds since moving up last year.
Calvillo lost to Katlyn Chookagian by unanimous decision in her last match at UFC 255, snapping a four-fight unbeaten streak.
Andrade is ranked No. 1 in the division while Calvillo sits at No. 5.
A light heavyweight title clash between champion Jan Blachowicz and Glover Teixeira is scheduled to headline UFC 266. The promotion has not announced a location for the event.