[2] The draw for the fourth stage was held on 19 March 2018, 11:00 at CBF headquarters in Rio de Janeiro.
[3] The 10 qualified teams were in a single group (CBF ranking shown in parentheses).
In the fourth stage, each tie was played on a home-and-away two-legged basis.
If tied on aggregate, the away goals rule would not be used, extra time would not be played and the penalty shoot-out would be used to determine the winner.
Tied 2–2 on aggregate, Vitória won on penalties and advanced to the round of 16.