Where: StubHub Center, Carson, Calif.

When: 9 p.m.

Records: United 3-18-5, 14 points; Chivas 5-15-7, 22.

D.C. probable starters: GK Bill Hamid; Ds Chris Korb, Ethan White, Daniel Woolard, James Riley; MFs Nick DeLeon, Perry Kitchen, John Thorrington, Luis Silva, Lewis Neal; F Conor Doyle.

Chivas probable starters: GK Dan Kennedy; Ds Carlos Borja, Carlos Bocanegra, Bobby Burling, Marco Delgado; MFs Carlos Alvarez, Oswaldo Minda, Edgar Mejia, Bryan de la Fuente; Fs Julio Morales, Erick Torres.

Outlook: MLS’s last-place clubs also are, not coincidentally, the league’s poorest defensive units. Chivas has conceded 48 goals, United 43. While D.C. is 1-7-2 in the past 10 outings, Chivas is 1-4-2 in the last seven. United is 0-10-3 on the road with four goals scored and 22 allowed. F Dwayne De Rosario, D Dejan Jakovic and MF Kyle Porter are on Canadian national team duty in Spain for a friendly against Mauritania on Monday. With eight games remaining, United is two losses shy of equalizing the most defeats in a season (2010). D.C.’s Silva, in his second pro season, and Chivas’s Alvarez, a rookie, were high school teammates in Los Angeles. F Erick Torres, 20, has scored six goals in eight starts since joining Chivas USA two months ago on loan from the parent club, Chivas Guadalajara in Mexico. He had two-goal games on consecutive weekends against New York and Vancouver but was contained by Seattle on Wednesday in a 1-0 Sounders victory.

— Steven Goff