Associated Press
FC Dallas defender Zach Loyd and Galaxy forward Mike Magee battle for control of the ball during the first half.

CARSON, Calif. — David Beckham and Juninho scored to help the Los Angeles Galaxy rally for a 2-1 victory over FC Dallas on Sunday night.

The Galaxy (18-7-5) will face Seattle in the playoffs after winning the Supporters' Shield for finishing with the league's best record.

"Tonight was a step forward," Galaxy coach Bruce Arena said. "We haven't been in a game where we've been forced to show up, play hard, fight and scrap for everything we could get. We did that tonight."

The Supporters' Shield is the first trophy that the Galaxy won since Beckham joined the team in 2007.

"I've won quite a few accolades and awards over the years," Beckham said. "But for us, it's not over. We want to go all the way and we want to win everything."

Atiba Harris scored for Dallas (12-4-14), which will play defending MLS Cup champion Real Salt Lake.

"I think any of those four teams could end up in the championship game," Dallas coach Schellas Hyndman said. "We would have won the Supporter's Shield last year with the points we have. That's just a compliment to all the other teams that are doing so well."

Juninho broke a 1-1 tie in the 46th minute. Dallas defender Zach Loyd headed Landon Donovan's aerial pass to Juninho, who volleyed it into the net from 18 yards.

Harris gave Dallas a 1-0 lead in the 22nd minute with a 5-yard header off Eric Alexander's left-wing cross. Alexander began the play by intercepting Galaxy defender Sean Franklin's attempted clearance.

"To my surprise, they came out with all their guns," Arena said. "We had to keep our concentration for 90 minutes."

Beckham tied it in the 33rd minute. Donovan pushed Dallas' Jackson Goncalves away to steal the ball near the left end line and passed to Beckham, who fired a low 23-yard shot between goalkeeper Dario Sala and the left post.

Donovan received his league-leading 16th assist, a career high.

Edson Buddle had two chances to tie San Jose's Chris Wondolowski for the league lead goals. But in the 67th minute, Sala used his right hand to block Buddle's 7-yard header off Beckham's corner kick.

In the 68th minute, Sala dropped Beckham's corner kick but Buddle shot the loose ball wide of the right post.

Wondolowski finished with 18 goals.

CREW 3, UNION 1: At Columbus, Ohio, Columbus midfielder Eddie Gaven set up a penalty, assisted on a goal and made two saves to help the Crew beat Philadelphia.

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Gaven took over for goalkeeper William Hesmer in the 86th minute after Hesmer had to leave the match after a collision with Union (8-15-7) defender Danny Califf.

The goalie broke his right shoulder on the play and will be out for the playoffs. Andy Gruenebaum will take over when the Crew play Colorado this week.

The Crew had already used their three substitutes so Gaven was forced to play the goal.

The Union's Sebastien Le Toux made it 3-1 in the 87th minute with a strike from 20 yards that went through Gaven's gloves.