The 2015 Copa Sudamericana final stages were played from September 22 to December 9, 2015. A total of 16 teams competed in the final stages to decide the champions of the 2015 Copa Sudamericana.[1]
The 15 winners of the second stage (eight from winners of the first stage, four from Brazil, three from Argentina) and the defending champions qualified for the final stages.
| Winners of the second stage | Defending champions | |||||||
|---|---|---|---|---|---|---|---|---|
| width=240 | Winners of the first stage | width=240 | Brazil | width=240 | Argentina | |||
| valign=top | valign=top | valign=top | valign=top | Winner O16:  River Plate | ||||
The qualified teams were seeded in the final stages according to the draw of the tournament, which was held on July 16, 2015, 20:00 UTC−4, at the Salón Joao Havelange of the CONMEBOL Convention Centre in Luque, Paraguay, with each team assigned a "seed" 1–16 by draw.[1] [2]
| Seed | width=200 | Team | Round of 16 |
|---|---|---|---|
| 1 |  LDU Quito | Match A | |
| 2 | Defensor Sporting | Match B | |
| 3 |  Santa Fe | Match C | |
| 4 | Sportivo Luqueño | Match D | |
| 5 |  Brasília | Match E | |
| 6 | Olimpia | Match F | |
| 7 | Huracán | Match G | |
| 8 | Chapecoense | Match H | |
| 9 | Libertad | Match H | |
| 10 | Sport Recife | Match G | |
| 11 | Independiente | Match F | |
| 12 | Atlético Paranaense | Match E | |
| 13 | Deportes Tolima | Match D | |
| 14 | Emelec | Match C | |
| 15 | Lanús | Match B | |
| 16 | River Plate | Match A |
In the final stages, the 16 teams played a single-elimination tournament, with the following rules:[1]
The bracket of the knockout stages was determined by the seeding as follows:[1]
The first legs were played on September 22–24, and the second legs were played on September 29–30 and October 1, 2015.[3] |}
----River Plate won 2–1 on aggregate and advanced to the quarterfinals (Match S1).
----Tied 0–0 on aggregate, Defensor Sporting won on penalties and advanced to the quarterfinals (Match S2).
----Tied 2–2 on aggregate, Santa Fe won on away goals and advanced to the quarterfinals (Match S3).
----Sportivo Luqueño won 2–1 on aggregate and advanced to the quarterfinals (Match S4).
----Atlético Paranaense won 1–0 on aggregate and advanced to the quarterfinals (Match S4).
----Independiente won 1–0 on aggregate and advanced to the quarterfinals (Match S3).
----Huracán won 4–1 on aggregate and advanced to the quarterfinals (Match S2).
----Tied 2–2 on aggregate, Chapecoense won on penalties and advanced to the quarterfinals (Match S1).
The first legs were played on October 20–22, and the second legs were played on October 27–29, 2015.[4] |}
----River Plate won 4–3 on aggregate and advanced to the semifinals (Match F2).
----Huracán won 1–0 on aggregate and advanced to the semifinals (Match F2).
----Santa Fe won 2–1 on aggregate and advanced to the semifinals (Match F1).
----Sportivo Luqueño won 2–1 on aggregate and advanced to the semifinals (Match F1).
Since there were two semifinalists from Argentina, they had to play each other instead of their original opponents as determined by the seeding.
The first legs were played on November 4–5, and the second legs were played on November 25–26, 2015.[5] |}
----Tied 1–1 on aggregate, Santa Fe won on away goals and advanced to the finals.
----Huracán won 3–2 on aggregate and advanced to the finals.
See main article: 2015 Copa Sudamericana Finals.
The finals were played on a home-and-away two-legged basis, with the higher-seeded team hosting the second leg. If tied on aggregate, the away goals rule would not be used, and 30 minutes of extra time would be played. If still tied after extra time, the penalty shoot-out would be used to determine the winner.[1]
The first leg was played on December 2, and the second leg was played on December 9, 2015.[6] ----Tied 0–0 on aggregate, Santa Fe won on penalties.