The
MLS Cup is the post-season championship of
Major League Soccer (MLS), a professional club soccer league in the United States and Canada. The
2018 season was the 23rd in MLS history, and was contested by 23 teams in two conferences—the
east and
west. Each club played 34 matches during the regular season from March to October, facing each team in the same conference at least twice and teams in the other conference at least once. The playoffs, running from late October to early December, were contested between the top six clubs in each conference and included four rounds: a one-match knockout round for the lowest-seeded teams, two rounds of home-and-away series to determine the conference champions, and the one-match final. The finalists,
Atlanta United FC and the
Portland Timbers, were both expansion teams that had played in the league for less than seven seasons. The two teams played each other once in the regular season, tying 1–1 in Atlanta on June 24. The match also marked the first time that two teams coached by managers from
Latin America faced each other in the MLS Cup final; both managers had never previously reached an MLS Cup final. The defending MLS Cup champions,
Toronto FC, failed to qualify for the 2018 playoffs, while runners-up
Seattle Sounders FC were eliminated in the Conference Semifinals by Portland.
Atlanta United FC set a new MLS record for goals scored in a season
Atlanta United FC entered the league as an
expansion team in 2017 and appeared in their first MLS Cup final in their second season. The team became the first expansion team in eight years to qualify for the playoffs in their inaugural season, but were eliminated in the knockout round after losing to the
Columbus Crew in a
penalty shootout. Atlanta started the season with a loss to the
Houston Dynamo that was followed by a run of eight matches without a defeat that lasted until May. The team continued to win, particularly at home, and overtook both
New York City FC and the
New York Red Bulls in the
Supporters' Shield rankings by the end of the summer. A loss to the Red Bulls in late September and
Toronto FC on the final day of the regular season left Atlanta without a Supporters' Shield, finishing second in the Eastern Conference and second overall to the New York Red Bulls.
Josef Martínez set a new league goal-scoring record, with 31 regular season goals, and was named to the
MLS Best XI alongside teammate
Miguel Almirón, who recorded 12 goals and 14 assists. Both players were also finalists for the
league's most valuable player award, which Martínez won. Head coach
Gerardo Martino was named
MLS Coach of the Year and announced his plans in October to leave the club following the end of the season. The club faced third-place New York City FC in the Conference Semifinals, winning 1–0 at
Yankee Stadium in
New York City on a goal by
Eric Remedi. Atlanta defeated New York City 3–1 in the second leg with two goals by Josef Martínez, securing a berth to the Conference Finals with a 4–1 aggregate win. Atlanta opened the Conference Finals against the New York Red Bulls with a 3–0 victory at Mercedes-Benz Stadium before a crowd of 70,016 spectators. Despite losing 1–0 in the second leg, the club secured its first-ever MLS Cup berth and hosting rights with a 3–1 aggregate win.
Portland Timbers The
Portland Timbers entered MLS as an expansion team in 2011 and won their first MLS Cup in
2015, defeating the Columbus Crew. Head coach
Giovanni Savarese was hired at the beginning of the season to replace
Caleb Porter; Savarese previously led the
New York Cosmos to three playoff championships in the second-division
North American Soccer League, including one against the
Atlanta Silverbacks. During the offseason, Portland traded away midfielder
Darlington Nagbe and defender
Gbenga Arokoyo to Atlanta United FC for $1.65 million in
allocation money, and also declined contract options for forward
Darren Mattocks and defender
Ben Zemanski. Savarese used the targeted allocation money to sign several young players, including midfielder
Cristhian Paredes and forward
Samuel Armenteros, who were placed in the starting lineup. Portland started the season with five straight road games due to an expansion project at
Providence Park, which finished in three losses and two draws. After returning to Providence Park in April, the Timbers went on a fifteen-match unbeaten streak (tying a club record) that was broken by a loss to
Vancouver Whitecaps FC in August. By late September, however, Portland had only won three more matches and lost six—being outscored 15–5 in away games. After winning 4–1 and 3–0 in successive matches against
Real Salt Lake to close out the season, the Timbers qualified for the playoffs as the fifth-seed in the Western Conference, Despite a
red card being shown to defender
Larrys Mabiala, Portland won 2–1 on two goals by
Diego Valeri and advanced to the semifinals to face
longtime rivals and defending Western Conference champions
Seattle Sounders FC. After winning the first leg 2–1 at home, the Timbers lost their aggregate lead during the second leg as the Sounders rallied to tie the series at 3–3 and force
extra time. The two teams both scored a goal in extra time, tying the series 4–4 on aggregate, and the match went into a
penalty shootout that Portland won 4–2 after five rounds. The match in Seattle was called one of the best playoff matches in league history due to its dramatic finish. Portland then played top-seed
Sporting Kansas City in the Conference Finals, drawing 0–0 at home. The Timbers fell behind in the first half of the second leg, but rallied to win 3–2 on a pair of goals by Diego Valeri. The Timbers are the first fifth-seeded team to reach the MLS Cup final.
Summary of results :
Note: In all results below, the score of the finalist is given first (H: home; A: away). ==Venue and ticketing==