Sanneh was a member of the 1996 Open Cup champs D.C. United
Chicago won its first Open Cup in its inaugural year under Coach Bob Bradley in 1998 when it also won the MLS crown, and Bradley guided it to the 2000 Open Cup title as well.
Sarachan, in his first year in charge of the Fire, won the 2003 Open Cup while finishing runner-up in MLS. The Fire finished runner-up in the Open Cup in 2004.
The last of the four other teams to have won the 93-year-old tournament at least four times was Los Angeles Maccabee SC in 1978.
"I can't help but smile," Sarachan said. "It's not very often you get to say you're a champion. We've made it a priority this year to win a couple of championships. They're going to enjoy tonight, but they know there's more work to be done."
LAMAR HUNT U.S. OPEN CUP, Final
Sept. 27 in Bridgeview, Ill.
Chicago 3 Los Angeles 1. Goals: Jaqua (Herron) 9, Herron (Mapp) 16, Thiago (Sanneh) 88; Gordon 52.
Chicago -- Pickens; Brown, Sanneh, Segares, Gutierrez, Pause, Mapp (Thiago, 86), Guerrero, Jaqua, Rolfe (Curtin, 91+), Herron (Robinson, 82).
Los Angeles - Hartman, Jazic, Albright, Marshall, Ihemelu (Gomez, 77), Vagenas, Jones (Kirk, 72), Nagamura, Donovan, Gordon, Quaranta.
Yellow cards: Chicago -- Pickens 52, Gutierrez 59, Gutierrez 90. Los Angeles -- Albright 25, Nagamura 52, Quaranta 71, Gordon 75.
Red card: Chicago -- Gutierrez 90.
Referee: Terry Vaughn; Assistants: Chris Strickland, Richard Eddy; 4th Official: Michael Kennedy.