2017 Copa Sudamericana second stage
The 2017 Copa Sudamericana second stage was played from 27 June to 9 August 2017. A total of 32 teams competed in the second stage to decide the 16 places in the final stages of the 2017 Copa Sudamericana.
Draw
The draw for the second stage was held on 14 June 2017, 20:00 PYT, at the CONMEBOL Convention Center in Luque, Paraguay. For the second stage, the teams were allocated to two pots according to their previous results in this season:
- Pot 1: 10 teams transferred from the Copa Libertadores and six best winners of the first stage from the Copa Sudamericana
- Pot 2: 16 remaining winners of the first stage from the Copa Sudamericana
The following were the 10 teams transferred from the Copa Libertadores.
| Match | Best teams eliminated in third stage | Second stage draw |
| G2 |  Olimpia | Pot 1 |
| G4 |  Junior | Pot 1 |
| Group | Third-placed teams in group stage | Second stage draw |
| 1 |  Estudiantes | Pot 1 |
| 2 | Santa Fe | Pot 1 |
| 3 | Independiente Medellín | Pot 1 |
| 4 |  Flamengo | Pot 1 |
| 5 | Atlético Tucumán | Pot 1 |
| 6 | Libertad | Pot 1 |
| 7 | Chapecoense | Pot 1 |
| 8 |  Deportes Iquique | Pot 1 |
The following were the 22 winners of the first stage from the Copa Sudamericana. Matches in the first stage were considered for the ranking of teams for the second stage draw.
Format
In the second stage, each tie was played on a home-and-away two-legged basis. If tied on aggregate, the away goals rule would be used. If still tied, extra time would not be played, and the penalty shoot-out would be used to determine the winner.
The 16 winners of the second stage advanced to the round of 16 of the knockout stages.
Matches
The first legs were played on 27–29 June, 5–6 and 11–13 July, and the second legs were played on 25–27 July, 1–3 and 9 August 2017.Match O1
----Racing won 6–3 on aggregate and advanced to the round of 16.
Match O2
----Tied 2–2 on aggregate, Junior won on penalties and advanced to the round of 16.
Match O3
----Flamengo won 10–2 on aggregate and advanced to the round of 16.
Match O4
----Estudiantes won 3–0 on aggregate and advanced to the round of 16.
Match O5
----Independiente won 6–3 on aggregate and advanced to the round of 16.
Match O6
----Tied 1–1 on aggregate, LDU Quito won on penalties and advanced to the round of 16.
Match O7
----Ponte Preta won 4–1 on aggregate and advanced to the round of 16.
Match O8
----Santa Fe won 2–1 on aggregate and advanced to the round of 16.
Match O9
----Libertad won 7–1 on aggregate and advanced to the round of 16.
Match O10
----Sport Recife won 3–2 on aggregate and advanced to the round of 16.
Match O11
----Fluminense won 6–1 on aggregate and advanced to the round of 16.
Match O12
----Atlético Tucumán won 6–2 on aggregate and advanced to the round of 16.
Match O13
----Tied 3–3 on aggregate, Nacional won on away goals and advanced to the round of 16.
Match O14
----Tied 1–1 on aggregate, Chapecoense won on penalties and advanced to the round of 16.
Match O15
----Cerro Porteño won 6–2 on aggregate and advanced to the round of 16.
Match O16
----Corinthians won 3–1 on aggregate and advanced to the round of 16.