HOUSTON — Brian Ching scored six minutes into overtime and the Houston Dynamo advanced to the Western Conference final for the third time in four years with a 1-0 win over the Seattle Sounders on Sunday.

The teams dueled to a scoreless tie in the first leg of their two-game semifinal on Oct. 29, setting up the winner-take-all match in Houston. Fittingly, the league's top two defensive teams during the regular season played 90 more minutes without a goal before Ching's game winner.

The Dynamo advances to the single-game West final to face Los Angeles. Houston improved to 5-1 at home in the playoffs and 9-1-6 at home this season.

The Sounders, an expansion team, wrapped up their inaugural season by losing to Houston for the first time in five games (2-1-2).

Houston defender Mike Chabala set up the winning shot with a high cross from the left. The ball deflected off midfielder Brian Mullan and right to Ching, who beat goalkeeper Kasey Keller with a shot to the top left corner.

Seattle's Freddie Ljungberg shot at Houston's goal about four minutes later, but goalkeeper Pat Onstad leaped to punch it over the crossbar. The Sounders didn't get a better chance the rest of the game.

Seattle defender James Riley earned a red card in the final minute of overtime after tripping Ricardo Clark. The teams exchanged words at midfield before referee Jorge Gonzalez got in the middle of the crowd.

Houston outshot Seattle 15-10.

GALAXY 1, CHIVAS USA 0: At Carson, Calif., Landon Donovan sent the Los Angeles Galaxy to the Western Conference finals by burying a 73rd-minute penalty for a 1-0 victory over Chivas US.

Donovan tied an MLS record with his 16th postseason goal and put the Galaxy through 3-2 on aggregate after a 2-2 tie last week.

The Galaxy will host Houston in a single match Friday night to determine who goes to the MLS Cup final.

Donovan converted after Chivas USA's Yamith Cuesta fouled Mike Magee in the penalty area by wrapping his right leg around Magee's groin in the 70th minute. David Beckham began the play with a cross to Donovan, who passed to Magee on the right side of the area.

On the kick, Chivas goalkeeper Zach Thornton dove to his left, and Donovan sent the ball through the area Thornton vacated, tying Carlos Ruiz's mark.