Referee Jair Marrufo—one of the two American officials employed at the Copa America this year, alongside Mark Geiger—spent around 90 minutes without any sort of controversy at the center of Bolivia and Chile's match in Foxborough. He didn't miss any major calls and has appeared to rebound well from his poor showing in the MLS Cup final last season. But then, he screwed up, because that's what MLS refs do.
At some point really, really late in the game, Marrufo called a bogus handball on a Bolivia defender with the game tied 1-1, giving Chile a penalty-kick that Arturo Vidal finished, robbing La Verde of a huge point against the defending champions and basically handing their opponents a victory in a crucial group-stage match.