Here are the Professional Referees Organization ref assignments for Week 6's MLS play.
FRIDAY 04/05/13
Sporting Kansas City vs. D.C. United, Sporting Park (8:30 pm ET)
REFEREE: ARMANDO VILLARREAL
ASST 1: Corey E Rockwell
ASST 2: Jeff Muschik
4TH: Edvin Jurisevic
SATURDAY 04/06/13
Toronto FC vs. FC Dallas, BMO Field (4 pm ET)
REFEREE: ISMAIL ELFATH
ASST 1: Kermit Quisenberry
ASST 2: Kevin Klinger
4TH: Mathieu Bourdeau
Columbus Crew vs. Philadelphia Union, Columbus Crew Stadium (5 pm ET)
REFEREE: MATTHEW FOERSTER
ASST 1: Claudio Badea
ASST 2: Mark Cahen
4TH: Hilario Grajeda
Colorado Rapids vs. Real Salt Lake, Dick's Sporting Goods Park (7:30 pm ET)
REFEREE: CHRIS PENSO
ASST 1: CJ Morgante
ASST 2: Gregory Barkey
4TH: Ted Unkel
San Jose Earthquakes vs. Vancouver Whitecaps, Buck Shaw Stadium (10:30 pm ET)
REFEREE: FOTIS BAZAKOS
ASST 1: Fabio Tovar
ASST 2: Eric Proctor
4TH: Baldomero Toledo
Portland Timbers vs. Houston Dynamo, JELD-WEN Field (10:30 pm ET)
REFEREE: RICARDO SALAZAR
ASST 1: Ian Anderson
ASST 2: Mike Kampmeinert
4TH: Alejandro Mariscal
SUNDAY 04/07/13
Chicago Fire vs. New York Red Bulls, Toyota Park (5 pm ET)
REFEREE: ALLEN CHAPMAN
ASST 1: Chris Strickland
ASST 2: Corey Parker
4TH: Jorge Gonzalez
