Away goals rule
method of breaking ties in sports when teams play each other twice, once at each team's home ground, according to which the team that has scored more goals "away from home" will win if scores are otherwise equal / From Wikipedia, the free encyclopedia
The Away goals rule is a way of breaking ties in association football when two teams played two legs and once at each team's homeground. The rule says that the team that scored the most "away from home" is awarded the win. This rule is used in the UEFA Champions League, UEFA Europa League, FIFA World Cup qualification, CONCACAF Champions League, MLS Cup playoffs, AFC Champions League, AFC Cup, Copa Libertadores, Copa Sudamericana, CAF Champions League, CAF Confederation Cup, Liga MX playoffs, Football League Cup semifinals and Football League play-offs semifinals.