Mary McGee has four losses against four opponents on her boxing record. For a list of McGee's best fights, refer to "Best fights of Mary McGee".
On October 30, 2021 Mary McGee, the IBF champion, met Chantelle Cameron, the WBC and The Ring champion, in a super-lightweight world-title unification fight. McGee was 35 years old and with a record of 27-4 (15), and Cameron was 30 years old and with a record of 14-0 (8). McGee lost the fight via 10-round unanimous decision and lost her title.
On October 4, 2013 Mary McGee fought Érica Farías in a lightweight world-title fight for Farías' WBC title. McGee was 27 years old and with a record of 20-3 (11), and Farías was 29 years old and with a record of 17-0 (9). McGee lost the fight via 10-round unanimous decision.
On May 11, 2013 Mary McGee faced off against Holly Holm in a super-lightweight bout at age 26. She was coming in with a record of 20-2 (11). McGee lost the fight via 10-round unanimous decision.
On February 26, 2010 Mary McGee faced off against Brooke Dierdorff at age 23. She was coming in with a record of 17-1 (10). McGee lost the fight via 6-round unanimous decision.
