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
2017 season was the 22nd in MLS history and was contested by 22 teams in two conferences in 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 October to 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, and the one-match final. The two finalists, Toronto and Seattle, faced each other in the
2016 cup, which was won by Seattle in a penalty shootout. It was the third in league history to feature a rematch of the previous year, the other two being the 2006 and 2007 wins by
Houston Dynamo and the 2011 and 2012 wins by
LA Galaxy. The 2017 cup was also the first to see both of the higher-seeded sides advance from the conference finals since it was changed to a
home-and-away series, in 2012. The two teams played a single regular season match, hosted by Seattle in May, which Toronto won 1–0.
Toronto FC lead Toronto FC in goals scored during their treble campaign in 2017 After their MLS Cup loss, Toronto FC looked to return to the cup as well as compete for the
Supporters' Shield and
Canadian Championship. In addition to their 2016 roster, the team acquired French leftback
Chris Mavinga and Spanish midfielder
Víctor Vázquez to fill depth roles; manager
Greg Vanney placed a strong emphasis on an organized defense, one of the team's strengths during the 2016 season. The team entered the season as a favorite to win the cup, as well as a key challenger for the Supporters' Shield. Toronto immediately jumped into a run of good form, with only three losses in the first half of the season, and remained near level with
Chicago Fire at the top of the league. Despite two consecutive losses in September, Toronto finished the season as Supporters' Shield champion, breaking the record for most points (69) and tying the record for most wins (20). Toronto faced the
New York Red Bulls in the conference semifinals and took a 2–1 lead away in New Jersey. The team returned home and lost 1–0, but advanced on the
away goals rule with the 2–2 aggregate draw. The home fixture was marred by a halftime brawl between the teams that saw
Jozy Altidore sent off and
Sebastian Giovinco suspended for yellow card accumulation in receiving a yellow card in two consecutive matches. In the conference finals, Toronto traveled to play
Columbus Crew SC, earning a 0–0 away draw and a 1–0 win at home, qualifying them for the MLS Cup.
Seattle Sounders FC The Sounders entered the season as defending MLS Cup champions, their first title after years of early playoff exits. Head coach
Brian Schmetzer, promoted from his interim role, made offseason roster changes to replace older veteran players with younger talent that align with general manager
Garth Lagerwey's vision for the club. Among the additions were MLS veteran
Will Bruin,
homegrown player Henry Wingo, academy graduate
Nouhou Tolo, and veteran defenders
Gustav Svensson and
Kelvin Leerdam, adding to the team's depth positions. Seattle started the season slowly, with only five wins in the first 17 matches, due to injury troubles and inconsistent lineups. From late June to early September, the team welcomed back injured players and went on a 13-match unbeaten streak that put them in playoff contention. The streak ended with a series of draws and losses, but the Sounders recovered with three wins in late September and October to clinch a second-place finish in the Western Conference. Seattle faced their Canadian rivals, the
Vancouver Whitecaps FC, in the conference semifinals. After a scoreless draw in Vancouver, the Sounders returned home and won 2–0 on a pair of goals scored by
Clint Dempsey. In the conference finals, the Sounders played
Houston Dynamo and earned a 2–0 win in the away leg after a Dynamo player was sent off early in the match. Heading into the home leg with an advantage on away goals, Seattle went for an aggressive 3–0 win to give them a 5–0 aggregate win that was capped by home-and-away goals by former Dynamo forward
Will Bruin. The Sounders maintained a shutout streak that carried over from the 2016 Western Conference Final, reaching 647 minutes after the win over Houston.
Summary of results :
Note: In all results below, the score of the finalist is given first (H: home; A: away). ==Venue==