Argentina 1:1 Bolivia
Colombia 1:0 Costa Rica
Colombia are the early leaders of Group A after labouring to a 1-0 win over Costa Rica in Jujuy.
The host nation, boasting an all-star lineup including Lionel Messi and Carlos Tevez, had opening night nerves in La Plata, allowing Bolivia to steal a lead two minutes after half time through Edivaldo Rojas. But Sergio Aguero spared Argentina's blushes with a 76th minute equaliser.
Colombia, who won their only Copa at home in 2001, grabbed three points from Adrian Ramos' strike on the cusp of half-time. Invitees Costa Rica had Randall Brenes red-carded for a reckless knee-high tackle after 27 minutes. Los Cafeteros and Argentina meet in Santa Fe on Wednesday.
Sunday: Brazil v Venezuela, Paraguay v Ecuador
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In the FIFA Women's World Cup, the USA made it to the last eight, eliminating debutants Colombia with a 3-0 win in Sinsheim. Sweden are also through, after beating North Korea 1-0 in Augsburg.
Australia got their campaign back on track with a 3:2 win over Equatorial Guinea in Bochum, leaving three nations on three points in Group D going into tonight's Brazil v Norway clash.
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In the FIFA U-17 World Cup it is quarter-final time with Uruguay taking on Uzbekistan and Japan facing Brazil today, with England v Germany and France v Mexico tomorrow.