# 2018 Copa Sudamericana final stages

The 2018 Copa Sudamericana final stages were played from 21 August to 12 December 2018. A total of 16 teams competed in the final stages to decide the champions of the 2018 Copa Sudamericana.

## Qualified teams

The 16 winners of the second stage advanced to the round of 16.

### Seeding

Starting from the round of 16, the teams were seeded according to the second stage draw, with each team assigned a "seed" 1–16 corresponding to the tie they win (O1–O16) (Regulations Article 22.c).
| Seed | Match | Second stage winners |
| 1 | O1 | Millonarios |
| 2 | O2 | Botafogo |
| 3 | O3 | Nacional |
| 4 | O4 | Colón |
| 5 | O5 | Banfield |
| 6 | O6 | Fluminense |
| 7 | O7 | Atlético Paranaense |
| 8 | O8 | Deportivo Cali |
| 9 | O9 | LDU Quito |
| 10 | O10 | Caracas |
| 11 | O11 | Deportivo Cuenca |
| 12 | O12 | Defensa y Justicia |
| 13 | O13 | Junior |
| 14 | O14 | San Lorenzo |
| 15 | O15 | Bahia |
| 16 | O16 | Santa Fe |

## Format

Starting from the round of 16, the teams played a single-elimination tournament with the following rules:
* Each tie was played on a home-and-away two-legged basis, with the higher-seeded team hosting the second leg (Regulations Article 22.d).
* In the round of 16, quarterfinals, and semifinals, 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 27).
* In the finals, 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 (Regulations Article 28).

## Bracket

The bracket starting from the round of 16 was determined as follows:
| Round | Matchups |
| Round of 16 | (Higher-seeded team host second leg) Match A: Winner O1 vs. Winner O16 Match B: Winner O2 vs. Winner O15 Match C: Winner O3 vs. Winner O14 Match D: Winner O4 vs. Winner O13 Match E: Winner O5 vs. Winner O12 Match F: Winner O6 vs. Winner O11 Match G: Winner O7 vs. Winner O10 Match H: Winner O8 vs. Winner O9 |
| Quarterfinals | (Higher-seeded team host second leg) Match S1: Winner A vs. Winner H Match S2: Winner B vs. Winner G Match S3: Winner C vs. Winner F Match S4: Winner D vs. Winner E |
| Semifinals | (Higher-seeded team host second leg) Match F1: Winner S1 vs. Winner S4 Match F2: Winner S2 vs. Winner S3 |
| Finals | (Higher-seeded team host second leg) Winner F1 vs. Winner F2 |
The bracket was decided based on the second stage draw, which was held on 4 June 2018.
| Round of 16 | Round of 16 | Round of 16 | Round of 16 | Round of 16 | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals | Semifinals | Semifinals | Semifinals | Semifinals | Semifinals | | Finals | Finals | Finals | Finals | Finals |
| 16 | Santa Fe (p) | 0 | 0 | 0 (5) | | | | | | | | | | | | | | | | |
| 1 | Millonarios | 0 | 0 | 0 (3) | | | | | | | | | | | | | | | | |
| 1 | Millonarios | 0 | 0 | 0 (3) | 16 | Santa Fe | 1 | 2 | 3 | | | | | | | | | | | |
| | | | | | 8 | Deportivo Cali | 1 | 1 | 2 | | | | | | | | | | | |
| 9 | LDU Quito | 1 | 0 | 1 (1) | 8 | Deportivo Cali | 1 | 1 | 2 | | | | | | | | | | | |
| 8 | Deportivo Cali (p) | 0 | 1 | 1 (3) | | | | | | | | | | | | | | | | |
| 8 | Deportivo Cali (p) | 0 | 1 | 1 (3) | | | | | | 16 | Santa Fe | 0 | 0 | 0 | | | | | | |
| | | | | | | | | | | 13 | Junior | 2 | 1 | 3 | | | | | | |
| 13 | Junior | 1 | 1 | 2 | | | | | | | | | | | 13 | Junior | 2 | 1 | 3 | | | | | | |
| 4 | Colón | 0 | 1 | 1 | | | | | | | | | | | | | | | | |
| 4 | Colón | 0 | 1 | 1 | 13 | Junior (a) | 2 | 1 | 3 | | | | | | | | | | | |
| | | | | | 12 | Defensa y Justicia | 0 | 3 | 3 | | | | | | | | | | | |
| 12 | Defensa y Justicia | 0 | 2 | 2 | 12 | Defensa y Justicia | 0 | 3 | 3 | | | | | | | | | | | |
| 5 | Banfield | 0 | 0 | 0 | | | | | | | | | | | | | | | | |
| 5 | Banfield | 0 | 0 | 0 | | | | | | | | | | | | 13 | Junior | 1 | 1 | 2 (3) |
| | | | | | | | | | | | | | | | | 7 | Atlético Paranaense (p) | 1 | 1 | 2 (4) |
| 15 | Bahia (p) | 2 | 1 | 3 (5) | | | | | | | | | | | | | | | | | 7 | Atlético Paranaense (p) | 1 | 1 | 2 (4) |
| 2 | Botafogo | 1 | 2 | 3 (4) | | | | | | | | | | | | | | | | |
| 2 | Botafogo | 1 | 2 | 3 (4) | 15 | Bahia | 0 | 1 | 1 (1) | | | | | | | | | | | |
| | | | | | 7 | Atlético Paranaense (p) | 1 | 0 | 1 (4) | | | | | | | | | | | |
| 10 | Caracas | 0 | 1 | 1 | 7 | Atlético Paranaense (p) | 1 | 0 | 1 (4) | | | | | | | | | | | |
| 7 | Atlético Paranaense | 2 | 2 | 4 | | | | | | | | | | | | | | | | |
| 7 | Atlético Paranaense | 2 | 2 | 4 | | | | | | 7 | Atlético Paranaense | 2 | 2 | 4 | | | | | | |
| | | | | | | | | | | 6 | Fluminense | 0 | 0 | 0 | | | | | | |
| 11 | Deportivo Cuenca | 0 | 0 | 0 | | | | | | | | | | | 6 | Fluminense | 0 | 0 | 0 | | | | | | |
| 6 | Fluminense | 2 | 2 | 4 | | | | | | | | | | | | | | | | |
| 6 | Fluminense | 2 | 2 | 4 | 6 | Fluminense | 1 | 1 | 2 | | | | | | | | | | | |
| | | | | | 3 | Nacional | 1 | 0 | 1 | | | | | | | | | | | |
| 14 | San Lorenzo | 3 | 0 | 3 | 3 | Nacional | 1 | 0 | 1 | | | | | | | | | | | |
| 3 | Nacional (a) | 1 | 2 | 3 | | | | | | | | | | | | | | | | |

## Round of 16

The first legs were played on 21–22 August, 18–20 and 26 September, and the second legs were played on 19, 25, 27 September, and 2–4 October 2018.
| Team 1 | Agg.Tooltip Aggregate score | Team 2 | 1st leg | 2nd leg |
| Santa Fe | 0–0 (5–3 p) | Millonarios | 0–0 | 0–0 |
| Bahia | 3–3 (5–4 p) | Botafogo | 2–1 | 1–2 |
| San Lorenzo | 3–3 (a) | Nacional | 3–1 | 0–2 |
| Junior | 2–1 | Colón | 1–0 | 1–1 |
| Defensa y Justicia | 2–0 | Banfield | 2–0 | 0–0 |
| Deportivo Cuenca | 0–4 | Fluminense | 0–2 | 0–2 |
| Caracas | 1–4 | Atlético Paranaense | 0–2 | 1–2 |
| LDU Quito | 1–1 (1–3 p) | Deportivo Cali | 1–0 | 0–1 |

### Match A

Tied 0–0 on aggregate, Santa Fe won on penalties and advanced to the quarterfinals (Match S1).

### Match B

Tied 3–3 on aggregate, Bahia won on penalties and advanced to the quarterfinals (Match S2).

### Match C

Tied 3–3 on aggregate, Nacional won on away goals and advanced to the quarterfinals (Match S3).

### Match D

Junior won 2–1 on aggregate and advanced to the quarterfinals (Match S4).

### Match E

Defensa y Justicia won 2–0 on aggregate and advanced to the quarterfinals (Match S4).

### Match F

Fluminense won 4–0 on aggregate and advanced to the quarterfinals (Match S3).

### Match G

Atlético Paranaense won 4–1 on aggregate and advanced to the quarterfinals (Match S2).

### Match H

Tied 1–1 on aggregate, Deportivo Cali won on penalties and advanced to the quarterfinals (Match S1).

## Quarterfinals

The first legs were played on 23–25 October, and the second legs were played on 30–31 October and 1 November 2018.
| Team 1 | Agg.Tooltip Aggregate score | Team 2 | 1st leg | 2nd leg |
| Santa Fe | 3–2 | Deportivo Cali | 1–1 | 2–1 |
| Bahia | 1–1 (1–4 p) | Atlético Paranaense | 0–1 | 1–0 |
| Fluminense | 2–1 | Nacional | 1–1 | 1–0 |
| Junior | 3–3 (a) | Defensa y Justicia | 2–0 | 1–3 |

### Match S1

Santa Fe won 3–2 on aggregate and advanced to the semifinals (Match F1).

### Match S2

Tied 1–1 on aggregate, Atlético Paranaense won on penalties and advanced to the semifinals (Match F2).

### Match S3

Fluminense won 2–1 on aggregate and advanced to the semifinals (Match F2).

### Match S4

Tied 3–3 on aggregate, Junior won on away goals and advanced to the semifinals (Match F1).

## Semifinals

The first legs were played on 7–8 November, and the second legs were played on 28–29 November 2018.
| Team 1 | Agg.Tooltip Aggregate score | Team 2 | 1st leg | 2nd leg |
| Santa Fe | 0–3 | Junior | 0–2 | 0–1 |
| Atlético Paranaense | 4–0 | Fluminense | 2–0 | 2–0 |

### Match F1

Junior won 3–0 on aggregate and advanced to the finals.

### Match F2

Atlético Paranaense won 4–0 on aggregate and advanced to the finals.

## Finals

In the finals, 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 (Regulations Article 28).
The first leg was played on 5 December, and the second leg was played on 12 December 2018.
Tied 2–2 on aggregate, Atlético Paranaense won on penalties.