John Riel Casimero losses
Over 19 years as a professional, John Riel Casimero has compiled a 36-5-1 (25) record, including 20 title fights across four weight classes. He has five losses, three of them in title fights.
5. John Riel Casimero loses to Kyonosuke Kameda via unanimous decision
On October 25, 2025 John Riel Casimero faced Kyonosuke Kameda in a super bantamweight bout. Casimero was 36 years old with a record of 34-4-1, and Kameda was 27 with a record of 15-5-2. Casimero was coming off a win, while Kameda was on a 2-fight losing streak. Casimero lost via unanimous decision. Went the distance with Kameda.
4. John Riel Casimero loses to Jonas Sultan via unanimous decision
On September 16, 2017 John Riel Casimero faced Jonas Sultan in a flyweight bout. Casimero was 28 years old with a record of 24-3, and Sultan was 25 with a record of 13-3. Casimero was on a 3-fight winning streak and Sultan was on a 4-fight winning streak. Casimero lost via unanimous decision. Went the distance with Sultan.
3. John Riel Casimero loses to Amnat Ruenroeng via unanimous decision
On June 27, 2015 John Riel Casimero fought Amnat Ruenroeng for the IBF flyweight title. Casimero was 26 years old with a record of 21-2, and Ruenroeng was 35 with a record of 15-0. Casimero was on a 7-fight winning streak and Ruenroeng was on an undefeated 15-fight winning streak. Casimero lost via unanimous decision. Failed to capture the title. Went the distance with Ruenroeng.
2. John Riel Casimero loses to Moruti Mthalane via KO
On March 26, 2011 John Riel Casimero fought Moruti Mthalane for the IBF flyweight title. Casimero was 22 years old with a record of 14-1, and Mthalane was 28 with a record of 26-2. Casimero was coming off a loss, while Mthalane was on a 3-fight winning streak. Mthalane stopped Casimero via TKO in the 5th round. Failed to capture the title.
1. John Riel Casimero loses to Ramon Garcia Hirales via split decision
On July 24, 2010 John Riel Casimero defended his WBO interim light flyweight title against Ramon Garcia Hirales. Casimero was 21 years old with a record of 14-0, and Hirales was 0 with a record of 0-0. Casimero was on an undefeated 14-fight winning streak. Casimero lost via split decision. Lost the title. Went the distance with Hirales.