Graham Zusi had a goal and two assists, leading Sporting Kansas City past the host Philadelphia Union, 3-1, as Major League Soccer celebrated its Opening Day.

Oriol Rosell and Claudio Bieler also scored for Sporting Kansas City, the defending Eastern Conference champions.

Sporting Kansas City is now 12-4-2 in season-opening games, the best mark in MLS.

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Zusi’s unassisted goal came in the 41st minute and tied it at 1.

Rosell scored in the 66th minute with Zusi receiving the assist from a free kick.

Sporting Kansas City put the game away when Bieler scored in the 83d minute.

Dynamo 2, DC United 0 — Ricardo Clark helped create a D.C. United own goal and then scored one of his own to lead host Houston to a victory in a rematch of the 2012 Eastern Conference championship.

The Dynamo took a 1-0 lead on an own goal by United’s James Riley in the 80th minute. Off Brad Davis’s corner kick, Riley and Clark went up for the ball, with Riley heading it into the left net.

Clark extended Houston’s lead to 2-0 in the 89th minute, taking a pass from Warren Creavalle outside the right 6-yard box and sending it high inside the far post.

FC Dallas 1, Rapids 0 — Jackson scored in the 11th minute before FC Dallas held on to beat Colorado, improving its all-time home record against the Rapids to 20-6-4.

Jackson struck after David Ferreira launched a lead ball from beyond midfield. Jackson tried to chase it down and as goalkeeper Steward Ceus charged out of the penalty area, it bounced over him, allowing Jackson an easy shot into an open net.

Ceus, starting in place of veteran Matt Pickens, who sat out due to a leg injury, settled down after that and made five saves.

Impact 1, Sounders 0 — Davy Arnaud caught Seattle goalkeeper Michael Gspurning off his line and scored in the 35th minute as visiting Montreal opened with a surprising win.

Earlier in the day, the Sounders and designated player Christian Tiffert agreed to part ways with a buyout.

Crew 3, Chivas USA 0 — Federico Higuain scored early in the second half and Josh Williams and Dominic Oduro added late ones as Columbus won in Carson, Calif.

Whitecaps 1, Toronto FC 0 — Gershon Koffie scored in the 60th minute as host Vancouver won its opener for the third year in a row.