Main article: Judo at the 2010 South American Games
The Women's 78 kg event at the 2010 South American Games was held on March 19.
Medalists
| Gold | Silver | Bronze |
Lorena Briceño Argentina
|
Anny Cortez Colombia
|
Diana Zamora EcuadorKeivi Pinto  Venezuela
|
Results
Round Robin
| Class | Athlete | Contest | Points | ||||
|---|---|---|---|---|---|---|---|
| Pld | W | L | W | L | Diff | ||
 |
Lorena Briceño (ARG) |
4 | 4 | 0 | 32 | 0 | +32 |
 |
Anny Cortez (COL) |
4 | 3 | 1 | 17 | 10 | +7 |
 |
Diana Zamora (ECU) |
4 | 2 | 2 | 15 | 12 | +3 |
|
Keivi Pinto (VEN) |
4 | 1 | 3 | 10 | 27 | -17 |
| 5 |  Steffani Lupetti (BRA) |
4 | 0 | 4 | 0 | 25 | -25 |
Points system:
| 10 | Ippon/Hansoku Make |
| 7 | Waza-ari/Shido(3) |
| 5 | Yuko/Shido (2) |
| 1 | Yusei-gachi (decision) |
Contests
| 1 | Steffani Lupetti (BRA)
|
(0) 000 | — | 001 (5) | Diana Zamora (ECU)
|
| 2 | Lorena Briceño (ARG)
|
(10) 100 | — | 010 | Anny Cortez (COL)
|
| 3 | Steffani Lupetti (BRA)
|
(0) 000 | — | 100 (10) | Keivi Pinto (VEN)
|
| 4 | Diana Zamora (ECU)
|
(0) 010 | — | 011 (7) | Lorena Briceño (ARG)
|
| 5 | Anny Cortez (COL)
|
(7) 010 | — | 002 (0) | Keivi Pinto (VEN)
|
| 6 | Steffani Lupetti (BRA)
|
(0) 000 | — | 003 (5) | Lorena Briceño (ARG)
|
| 7 | Diana Zamora (ECU)
|
(10) 121 | — | 002 (0) | Keivi Pinto (VEN)
|
| 8 | Steffani Lupetti (BRA)
|
(0) 000 | — | 002 (5) | Anny Cortez (COL)
|
| 9 | Lorena Briceño (ARG)
|
(10) 100 | — | 000 (0) | Keivi Pinto (VEN)
|
| 10 | Diana Zamora (ECU)
|
(0) 000 | — | 001 (5) | Anny Cortez (COL)
|