Here is a list of O'Neill's best fights. For a list of O'Neill's losses, refer to "Casey O'Neill Losses".
On October 2, 2021 Casey O'Neill faced off against Antonina Shevchenko in a flyweight bout at age 23. She was coming in with a record of 8-0 (4), and Shevchenko was 36 years old and with a record of 9-3 (3). O'Neill stopped Antonina Shevchenko via TKO.
On February 20, 2021 Casey O'Neill faced off against Shana Dobson in a flyweight bout at age 23. She was coming in with a record of 6-0 (3), and Dobson was 31 years old and with a record of 4-4 (2). O'Neill stopped Shana Dobson via TKO.
On August 18, 2024 Casey O'Neill faced off against Luana Santos in a flyweight bout at age 26. She was coming in with a record of 10-2 (4). O'Neill won the fight via 3-round unanimous decision.
On February 12, 2022 Casey O'Neill faced off against Roxanne Modafferi in a flyweight bout at age 24. She was coming in with a record of 9-0 (4), and Modafferi was 39 years old and with a record of 25-19 (9). O'Neill won the fight via 3-round split decision.
On June 19, 2021 Casey O'Neill faced off against Lara Procópio in a flyweight bout at age 23. She was coming in with a record of 7-0 (3), and Procópio was 25 years old and with a record of 7-1 (3). O'Neill stopped Lara Procópio via choke-out.
