Chicago’s chances of winning a third Open Cup crown, after titles in 1998 and last year, were ruined with a 1-0 loss to Los Angeles in which Alexi Lalas came off the bench to score a golden goal. In the other semifinal, New England defeated 1996 winner D.C. United, 2-0, on goals by Andy Williams. Neither Los Angeles nor New England have been to an Open Cup final. They’ll meet Oct. 27. The site has yet to be determined. D.C. United’s Marco Etcheverry was ejected in the first half and Jaime Moreno saw red in the second half of their loss in Foxboro, Mass. In the Los Angeles-Chicago clash, the Fire’s Ante Razov, who wasn’t in the lineup, was ejected for confronting officials at halftime. Aug 22 in Fullerton, Calif. Los Angeles 1 Chicago 0 (OT) Scoring summary: Los Angeles- Lalas (Elliott) 94 Los Angeles — Kevin Hartman, Adam Frye, Danny Califf (Alexi Lalas, 77), Greg Vanney, Ezra Hendrickson, Simon Elliott, Peter Vagenas, Mauricio Cienfuegos, Sasha Victorine, Cobi Jones, Marvin Quijano (Isaias Bardales Jr., 63). Cautions — Califf 24, Jones 25, Quijano 29, Vanney 73, Elliott 92. Ejections — none. Chicago — Zach Thornton, C.J. Brown, Carlos Bocanegra, Evan Whitfield, Diego Gutierrez, Chris Armas, Jesse Marsch, Peter Nowak, DaMarcus Beasley, Dema Kovalenko, Hristo Stoitchkov (Sergi Daniv 16, Eric Wynalda, 80). Cautions — Whitfield 22, Marsch 44. Ejections — Razov ’48+. Referee: Ricardo Valenzuela. Asst: Jorge Reyes. Asst: Roger Itaya. 4th Official: Arnold Baldeaux. Attendance: 6,871. Aug. 22 in Foxboro, Mass. New England 2 D.C. United 0 Scoring Summary NE — Williams (Franchino, Chronopoulos) NE — Williams (Sunsing, Alvarez) New England — Jose Fernandez, Yari Allnut, Rusty Pierce, Mauricio Wright, Jay Heaps, Andy Williams, Ted Chronopoulos (Wolde Harrism 32), Leonel Alvarez (Matt Okoh, 77), Joe Franchino (Leo Cullen, 71) William Sunsing, Cate. Cautions — Allnutt 25, Okoh 85. Ejections — none. D.C. United — Mike Ammann, Brian Kamler, Eddie Pope, Ryan Nelsen (Chris Albright, 46), Carey Talley, Stephen Armstrong, Marco Etcheverry , Brian Namoff, Mark Lisi (Bobby Convey, 74′); Jaime Moreno, Santino Quaranta (Abdul Thompson Conteh, 54). Cautions — Quaranta 20, Moreno 25, Nelsen 39, Moreno 64. Ejections — Etcheverry 26, Moreno 64. Referee: Brian Hall. Referee’s Assistants: Richard Eddy, Chip Reed. Fourth Official: Gus St. Silva Attendance: 7,128.