Ketlen Vieira has four losses against four opponents on her MMA record. For a list of Vieira's best fights, refer to "Best fights of Ketlen Vieira".
On October 5, 2024 Ketlen Vieira faced off against Kayla Harrison in a bantamweight bout at age 33. She was coming in with a record of 14-4 (6), and Harrison was 34 years old and with a record of 17-1 (13). Vieira lost the fight via 3-round unanimous decision.
On January 14, 2023 Ketlen Vieira faced off against Raquel Pennington in a bantamweight bout at age 31. She was coming in with a record of 13-3 (6), and Pennington was 34 years old and with a record of 14-8 (4). Vieira lost the fight via 3-round split decision.
On February 20, 2021 Ketlen Vieira faced off against Yana Kunitskaya in a bantamweight bout at age 29. She was coming in with a record of 11-2 (6). Vieira lost the fight via 3-round unanimous decision.
On December 14, 2019 Ketlen Vieira faced off against Irene Aldana in a bantamweight bout at age 28. She was coming in with a record of 10-1 (6), and Aldana was 31 years old and with a record of 11-5 (8). Vieira lost the fight via 1st-round KO.
