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.
<section begin=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:
The 32 teams were drawn into 16 ties (O1âÂÂO16) between a team from Pot 1 and a team from Pot 2, with the teams from Pot 1 hosting the second leg. Teams from the same association could be drawn into the same tie.<section end=Draw />
The following were the 10 teams transferred from the Copa Libertadores (two best teams eliminated in the third stage of qualifying and eight third-placed teams in the group stage).
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.
<section begin=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 (Regulations Article 6.1).
The 16 winners of the second stage advanced to the round of 16 of the knockout stages.<section end=Format />
The first legs were played on 27âÂÂ29 June, 5âÂÂ6 and 11âÂÂ13 July, and the second legs were played on 25âÂÂ27 July, 1âÂÂ3 and 9 August 2017. <section begin=Second stage />
<section end=Second stage />
Racing won 6âÂÂ3 on aggregate and advanced to the round of 16 (Match A).
Tied 2âÂÂ2 on aggregate, Junior won on penalties and advanced to the round of 16 (Match B).
Flamengo won 10âÂÂ2 on aggregate and advanced to the round of 16 (Match C).
Estudiantes won 3âÂÂ0 on aggregate and advanced to the round of 16 (Match D).
Independiente won 6âÂÂ3 on aggregate and advanced to the round of 16 (Match E).
Tied 1âÂÂ1 on aggregate, LDU Quito won on penalties and advanced to the round of 16 (Match F).
Ponte Preta won 4âÂÂ1 on aggregate and advanced to the round of 16 (Match G).
Santa Fe won 2âÂÂ1 on aggregate and advanced to the round of 16 (Match H).
Libertad won 7âÂÂ1 on aggregate and advanced to the round of 16 (Match H).
Sport Recife won 3âÂÂ2 on aggregate and advanced to the round of 16 (Match G).
Fluminense won 6âÂÂ1 on aggregate and advanced to the round of 16 (Match F).
Atlético Tucumán won 6âÂÂ2 on aggregate and advanced to the round of 16 (Match E).
Tied 3âÂÂ3 on aggregate, Nacional won on away goals and advanced to the round of 16 (Match D).
Tied 1âÂÂ1 on aggregate, Chapecoense won on penalties and advanced to the round of 16 (Match C).
Cerro Porteño won 6âÂÂ2 on aggregate and advanced to the round of 16 (Match B).
Corinthians won 3âÂÂ1 on aggregate and advanced to the round of 16 (Match A).