The unified women's middleweight champion Claressa Shields has already described herself as the 'GWOAT' - the Greatest Woman of all Time - and she steps in the ring looking to improve her legacy further.
Her opponent is a late replacement, Maricela Cornejo, who comes into the fight as the underdog but with a decent resume of her own.
The 36-year-old is a former title holder, having won the WBC International super middleweight strap back in 2015.
She has had a few shots at a full world title, and is yet to succeed in her ambition to claim one, but an upset on Saturday night would propel her to unified status in one leap.
DAZN takes a look at the career of Cornejo ahead of this huge fight below.
Maricela Cornejo boasts a 14-5 professional record with five of those wins coming by way of knockout.
Maricela Cornejo's first and only world title success came in August 2015 when she beat Latashia Burton for the vacant WBC International women's super middleweight title.
She was unable to win any of her three tilts at a full world title, against Franchon Crews-Dezurn in September 2018 and September 2019, and against Kali Reis in April 2016.
Mana Studios, Miami, Florida, USA was the scene for Cornejo's triumph when she faced Latashia Burton and won by unanimous decision.
Going the full 10 rounds, she claimed the vacant WBC International women's super middleweight strap, her sole notable championship achievement so far.
The main card starts at 9 p.m. EDT / 2 a.m. BST (Sunday). The exact fight times are yet to be confirmed.
DAZN holds the rights to broadcast the fight globally, except for Latin America, Bulgaria, Poland, Slovenia, Kosovo, Bosnia and Herzegovina, North Macedonia, Montenegro, Croatia, Serbia, Philippines, China, South Africa, France and Nicaragua.
The fight takes place at Little Caesars Arena in Detroit, Michigan.