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- Promotion: ONE Championship
- Title: “ONE: Battleground 3”
- Venue: Singapore Indoor Stadium, Kallang, Singapore
- Date: August 27, 2021
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| BOUT # | WIN (County) | LOSS (Country) | DETAILS |
| PRELIMINARY CARD | |||
| 1 | Brandon Jenkins (USA) | Jacob Kilburn (USA) | Method: Knockout via Flying Knee Time & Round: 2:56 of Round 1 Referee: Gary Copeland Weight: Lightweight |
| 2 | Alejandro Flores Garcia (Mexico) | Carl Deaton (USA) | Method: Split Decision Time & Round: 5:00 of Round 3 Referee: Keith Peterson Weight: Featherweight |
| 3 | Bobby Moffett (USA) | Jason Knight (USA) | Method: Unanimous Decision Time & Round: 5:00 of Round 3 Referee: Larry Folsom Weight: Featherweight |
| 4 | Anthony Dizy (France) | Jesse Stirn (USA) | Method: Unanimous Decision Time & Round: 5:00 of Round 3 Referee: Andrew Glenn Weight: Featherweight |
| 5 | Chris Camozzi (USA) | Cory Hendricks (USA) | Method: Unanimous Decision Time & Round: 5:00 of Round 3 Referee: Gary Copeland Weight: Light Heavyweight |
| 6 | Sheymon Moraes (Brazil) | Lazar Stojadinovic (USA) | Method: Technical Knockout via Punches Time & Round: 4:45 of Round 2 Referee: Keith Peterson Weight: Featherweight |
| MAIN CARD | |||
| 7 | Marthin Hamlet (Norway) | Cezar Ferreira (Brazil) | Method: Technical Knockout via Leg Injury Time & Round: 0:13 of Round 1 Referee: Larry Folsom Weight: Light Heavyweight |
| 8 | Antonio Carlos Junior (Brazil) | Emiliano Sordi (Argentina) | Method: Unanimous Decision Time & Round: 5:00 of Round 3 Referee: Andrew Glenn Weight: Light Heavyweight |
| Co-Main Event | |||
| 9 | Chris Wade (USA) | Bubba Jenkins (USA) | Method: Unanimous Decision Time & Round: 5:00 of Round 3 Referee: Gary Copeland Weight: Featherweight |
| Main Event | |||
| 10 | Movlid Khaybulaev (Russia) | Brendan Loughnane (England) | Method: Split Decision Time & Round: 5:00 of Round 3 Referee: Keith Peterson Weight: Featherweight |
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