What: Union (2-4-1, seven points) at Seattle Sounders FC (5-1-1, 16 points)

When: Saturday, 4:30 p.m.

Where: Century Link Field, Seattle

TV: NBC Sports Network

On the web: Streaming at MLSSoccer.com

About the Sounders: Seattle sits third in a tightly contested Western Conference and hosts the Union following a 2-0 win against the conference rival Los Angeles Galaxy on Wednesday. The last time the Union played Seattle, in October of last season, was the last time the club scored more than one goal, with Freddy Adu and Brian Carroll tallying in a 2-0 win. . . . The Union look to return to .500 on the road (1-2) this season. Their only road win was 1-0 against Chivas USA on April 21. . . . While much of the hype in Seattle has centered on forward Freddy Montero, fellow forward David Estrada leads the club with four goals and has proven to be an efficient finisher, needing only eight shots on goal for his four goals. . . . Seattle does take chances when given the opportunity, with Montero among the league leaders with 35 shots and 11 shots on goal. . . . Before leaving Wednesday's game against Los Angeles with a hip injury, Seattle goalkeeper Michael Gspurning had replaced longtime favorite Kasey Keller. Gspurning boasts a 0.46 goals-against average and has four shutouts, but his status for Saturday is uncertain.

Injuries: Union: Roger Torres, midfielder (left-knee surgery recovery) and Krystian Witkowski, forward (concussion) are out. Gabriel Farfan, defender (left-hamstring strain) is doubtful. Brian Carroll, midfielder (right-hamstring strain) is questionable. Seattle: Josh Ford, goalie (right-knee stress fracture); Andrew Weber, goalie (left- ankle sprain); Michael Tetteh, defender (left- hamstring strain); Steve Zakuani, midfielder (right-leg fracture) and Babayele Sodade, forward (right-knee ACL tear) are out. Alvaro Fernandez, midfielder (right-quadriceps strain) is doubtful. Patrick Ianni, defender (lower-back pain) is questionable. Mauro Rosales, midfielder (right- foot contusion) is probable.

- Kerith Gabriel