The Professional Referee Organization has announced the referee assignments for Week 18 of the 2015 MLS season:

FRIDAY, JULY 3

Houston Dynamo vs. Chicago Fire
BBVA Compass Stadium (9 pm EDT, UDN, UnivisionDeportes.com in US, MLS LIVE in Canada)
REF: FOTIS BAZAKOS
AR1: Frank Anderson
AR2: Andrew Bigelow
4TH: Armando Villarreal

Seattle Sounders vs. D.C. United
CenturyLink Field (11 pm EDT, UniMás, UnivisionDeportes.com in US, MLS LIVE in Canada)
REF: SILVIU PETRESCU
AR1: Mike Rottersman
AR2: Marco Arruda
4TH: Baboucarr Jallow

SATURDAY, JULY 4

Columbus Crew vs. New York Red Bulls
MAPFRE Stadium (7:30 pm EDT, MLS LIVE)
REF: JUAN GUZMAN
AR1: Kermit Quisenberry
AR2: Kathryn Nesbitt
4TH: Mark Kadlecik

Montreal Impact vs. New York City
Stade Saputo (8 pm EDT, MLS LIVE in US, TVA Sports in Canada)
REF: JORGE GONZALEZ
AR1: Craig Lowry
AR2: Scott Kachmarik
4TH: Jose Carlos Rivero

Colorado Rapids vs. Vancouver Whitecaps
Dick’s Sporting Goods Park (9 pm EDT, TSN in Canada, MLS LIVE in US)
REF: ISMAIL ELFATH
AR1: Corey Parker
AR2: Richard Gamache
4TH: Younes Marrakchi

FC Dallas vs. New England Revolution 
Toyota Stadium (9 pm EDT, MLS LIVE)
REF: BALDOMERO TOLEDO
AR1: Felisha Mariscal
AR2: Kyle Longville
4TH: Armando Villarreal

Real Salt Lake v Orlando City
Rio Tinto Stadium (10 pm EDT, MLS LIVE)
REF: SORIN STOICA
AR1: Ian Anderson
AR2: Jason White
4TH: Alejandro Mariscal

LA Galaxy v Toronto FC
StubHub Center (10:30 pm EDT, Sportsnet 360 in Canada, MLS LIVE in US)
REF: CHRIS PENSO
AR1: Michael Kampmeinert
AR2: Eduardo Mariscal
4TH: Daniel Radford

SUNDAY, JULY 5

Portland Timbers vs. San Jose Earthquakes
Providence Park (5 pm EDT, ESPN2, ESPN Deportes, WatchESPN in US, TSN2 in Canada)
REF: RICARDO SALAZAR
AR1: Matthew Nelson
AR2: Apolinar Mariscal
4TH: Baboucarr Jallow