Who is the only fighter to have defeated Claressa Shields in her professional career?

Boxing icon Claressa Shields is undefeated as a pro boxer with a perfect 13-0 record. However, she also competes as a mixed martial artist in the PFL and suffered her first professional loss to Abigail Montes via split decision at PFL 10.

Shields made history when she became the first male or female boxer to hold all four major world titles - WBO, IBF, WBA, and WBC - simultaneously in two different weight classes. As a professional, Shields remains undefeated across 13 boxing matches and has only fought one non-championship bout in her boxing career, and that was her debut against Franchon Crews-Dezurn.

Her remaining 12 fights have all resulted in her either winning or defending a belt across the four major organizations. However, Shields has not restricted herself to the boxing ring. Her dominance in boxing prompted her to look for a new challenge, and she signed on with the mixed martial arts promotion Professional Fighters League.

After a convincing debut against Brittney Elkin, Claressa Shields lost for the first time in her professional career to Abigail Montes. The rare defeat may have been a reminder of Shields' only other loss that came in her amateur boxing career to Savannah Marshall.

The 2018 Female Fighter of the Year has a stellar amateur record, including two Olympic gold medals in London 2012 and Rio de Janeiro 2016. She has also secured gold medals at the IBF World Championships twice. However, the record is not as spotless as her professional record.

---

Claressa Shields avenges her only loss in a boxing ring

At the 2012 Women's World Championships held in China, Claressa Shields suffered her only amateur loss at the hands of Savannah Marshall. Subsequently, she was eliminated from the tournament and had to wait another two years before claiming gold.

Both boxers have since progressed to become world champions, but Shields continued to seek her revenge. After years of constant verbal exchanges, the two met on October 15, 2022, at the O2 Arena in London.

Marshall found success only when she tried to impose her size and strike Shields' body. However, it wasn't enough, as Shields took most of the rounds and won by a clear margin according to all three judges' scorecards.

The win awarded Claressa Shields a new belt to add to her ever-growing collection, the WBO female middleweight title, and some sweet revenge.