The third round of CONCACAF matches for 2018 FIFA World Cup qualification was played from 4 to 8 September 2015.
[1][3][4] The seeding was based on the FIFA World Rankings of August 2014 (shown in parentheses).
Note: Guatemala were seeded into Pot 3 as they had more FIFA ranking points (203.24) than Saint Vincent and the Grenadines (202.53).
El Salvador won 2–0 on aggregate and advanced to the fourth round (Group A).
Saint Vincent and the Grenadines won 3–2 on aggregate and advanced to the fourth round (Group C).