| | Event type
≤51 kilograms, Greco-Roman, Boys
| Date | 12 October 2018 |
|---|---|
| Status | YOG |
| Location | Asia Pavilion, Parque Olímpico de la Juventud, Villa Soldati, Buenos Aires |
| Participants | 6 from 6 countries |
| Pos | Wrestler | NOC | |||
|---|---|---|---|---|---|
| 1 | Wataru Sasaki |  JPN | Gold | ||
| 2 | Giorgi Tokhadze |  GEO | Silver | ||
| 3 | Axel Salas |  MEX | Bronze | ||
| 4 | Eduardo Lovera |  ARG | |||
| 5 | Mehdi Jouini |  TUN | |||
| 6 | Alexander Adiniwin |  MHL |
Round One (12 October 2018 — 10:05)
Group A (12 October 2018 — 10:05)
| Pos | Nr | Wrestler | NOC | Class. Pts | Tech. Pts | ||
|---|---|---|---|---|---|---|---|
| 1 | – | Wataru Sasaki | JPN | 8 | 19 | ||
| 2 | – | Axel Salas | MEX | 4 | 11 | ||
| 3 | – | Mehdi Jouini | TUN | 1 | 8 |
| Match #1 | Wataru Sasaki | JPN | Axel Salas | MEX | Great Superiority (10 - 1) |
| Match #2 | Wataru Sasaki | JPN | Mehdi Jouini | TUN | Technical Superiority (9 - 0) |
| Match #3 | Axel Salas | MEX | Mehdi Jouini | TUN | Decision by shutout (10 - 8) |
Group B (12 October 2018 — 10:05)
| Pos | Nr | Wrestler | NOC | Class. Pts | Tech. Pts | ||
|---|---|---|---|---|---|---|---|
| 1 | – | Giorgi Tokhadze | GEO | 9 | 14 | ||
| 2 | – | Eduardo Lovera | ARG | 5 | 4 | ||
| 3 | – | Alexander Adiniwin | MHL | 0 | 0 |
| Match #1 | Giorgi Tokhadze | GEO | Eduardo Lovera | ARG | Fall (–) |
| Match #2 | Giorgi Tokhadze | GEO | Alexander Adiniwin | MHL | Technical Superiority (8 - 0) |
| Match #3 | Eduardo Lovera | ARG | Alexander Adiniwin | MHL | Fall (–) |
Final Round (12 October 2018 — 17:15)
| Match 1/2 | Wataru Sasaki | JPN | Giorgi Tokhadze | GEO | Decision by shutout (11 - 7) |
| Match 3/4 | Axel Salas | MEX | Eduardo Lovera | ARG | Decision by shutout (5 - 3) |
| Match 5/6 | Mehdi Jouini | TUN | Alexander Adiniwin | MHL | Fall (–) |