Two of the Copa America's top contestants face a semifinal spot on Friday at the Olympic Stadium Nilton Santos in Rio de Janeiro. Brazil finished the knockout round at the top of Group B after winning all three matches and retained their 10-game stretch without a loss. Ecuador has been the only team to capture the host nation in a 1: 1 draw, highlighting Brazil's weaknesses over other competitors. Chile, on the other hand, struggled at the start of the tournament with extremely overwhelming performances, before advancing to…