Here is a list of Ouma's best fights. For a list of Ouma's losses, refer to "Kassim Ouma Losses".
On May 6, 2006 Kassim Ouma faced off against Marco Antonio Rubio in a super-welterweight bout at age 27. He was coming in with a record of 24-2-1 (15), and Rubio was 25 years old and with a record of 34-2-1 (30). Ouma won the fight via 12-round split decision.