Spain play next against Paraguay on Friday, while Slovenia meet South Africa the following day.
Farmers started roadblocks on Tuesday to prevent lorries from taking grain into Uruguay, Paraguay and Brazil.
Still, whatever the result, the reforms started by Andres Rodriguez have made Paraguay a better place.
Paraguay's neighbours, Argentina, Brazil, Chile and Uruguay, had all dumped their military leaders in recent years.
Paraguay was suspended from the group after last year's impeachment of the left-wing President Fernando Lugo.
Bolivia, Brazil, Colombia and Paraguay are playing their first competitive matches under their current coach.
Venezuelan President Hugo Chavez also said his country would halt all shipments to Paraguay.
Mercosur has more than trade to worry about: Paraguay's infant democracy looks increasingly wobbly.
Perhaps it would take a default for Paraguay's politicians finally to mend their ways.
That will not go down well with Uruguay and Paraguay, the group's smaller members.
Japan meet Paraguay in the final game of the three-nation Kirin Cup in Saitama on Tuesday.
In 2004 he returned to Paraguay, where he was convicted over his 1996 insubordination.
BBC: Paraguay candidate Lino Oviedo dies in helicopter crash
The container had come from Shanghai, China, and was bound for Paraguay, La Nacion newspaper reported.
That changed with the formation of Mercosur, an incipient customs union also involving Paraguay and Uruguay.
In Paraguay , General Lino Oviedo, the ruling party's controversial presidential candidate, was in hiding.
Paraguay's Senate has voted to impeach left-wing President Fernando Lugo, forcing him to step down.
Two of the countries in which it had investments, Paraguay and Ecuador, suffered system-wide financial collapse.
To Europe...which was one kind of strenuous, to Burma, Bangkok, Paraguay, which was also strenuous.
The 300, 000 Brazilians who have settled in Paraguay own many of its most productive farms.
What Paraguay really craves is more access for its clothing, beef and organic sugar.
"We must keep working hard and go to Paraguay to try to win, " said Maradona.
But the shy, sometimes awkward, Mr Lugo was an unlikely standard-bearer for a modernised Paraguay.
Left-wing presidents in Ecuador and Paraguay with grievances against Brazil are getting a sharper response.
Last week, dissident army officers came close to toppling Paraguay's government (see article).
"We are keeping the traffic from Argentina, Chile, Uruguay and Paraguay to Brazil, " Pires said.
Paraguay's revitalised opposition parties believe that the Colorado Party's grip on power can at last be ended.
In his victory speech, Mr Cartes said that that he would lead Paraguay in "a new direction".
He himself, a 51-year-old lawyer now married to a recent Miss Paraguay, was long a second-tier official.
One worry is the lawless area around Ciudad del Este, where Paraguay borders both Argentina and Brazil.
Paraguay started at a decent pace, certainly settling much quicker than Spain, and created some promising openings.
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