The 2018 Copa Sudamericana final stages are scheduled to be played from 21 August to 12 December 2018.[1] A total of 16 teams compete in the final stages to decide the champions of the 2018 Copa Sudamericana.[2]
Qualified teams
The 16 winners of the second stage advanced to the round of 16.
Starting from the round of 16, the teams are 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).[2]
Each tie is 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 is used. If still tied, extra time is not played, and the penalty shoot-out is used to determine the winner (Regulations Article 27).
In the finals, if tied on aggregate, the away goals rule is not used, and 30 minutes of extra time is played. If still tied after extra time, the penalty shoot-out is used to determine the winner (Regulations Article 28).
Bracket
The bracket starting from the round of 16 is 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.
Template:16TeamBracket-2Leg
† Order of legs to be decided, with the higher-seeded team in each tie hosting the second leg.
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.[3][4]
In the finals, if tied on aggregate, the away goals rule is not used, and 30 minutes of extra time is played. If still tied after extra time, the penalty shoot-out is used to determine the winner (Regulations Article 28).[2]