Friday features the first team from CONCACAF, but is highlighted by a rematch from the 2010 World Cup Final.
World Cup referee Yuichi Nishimura's controversial decisions marred much the tournament's opening match.
If Qatar were to lose its bid for the 2022 World Cup, would the United States be one of the next in line? One report says it could.
United is in first place for the first time in two years after a 4-2 victory over Montreal.
Luis Silva's hat trick propels D.C. United past Montreal Impact, into Eastern Conference lead.