Greece warmed up for their World Cup opener with a 2-2 draw against North Korea in Altach, Austria, on Tuesday evening.
The Greeks twice led through goals from Kostas Katsouranis (two) and Angelos Charisteas (49), but a brace from Kawasaki Frontale forward Jong Tae-Se (24 and 52) pegged them back.
Otto Rehhagel's side start their World Cup campaign against Group B opponents South Korea on June 12, before games against Nigeria and Argentina.
North Korea are in the toughest of the eight pools in South Africa, Group G, alongside Brazil, Ivory Coast and Portugal.
Elsewhere, Cameroon were also held to a goalless draw by Georgia in Linz. The Indomitable Lions, who are coached by former Lyon boss Paul Le Guen, kick off their World Cup campaign against Japan before games against Denmark and Holland.
Coach Lars Lagerback's first match in charge of Nigeria ended in a 0-0 draw against Saudi Arabia in Wattens.
Paraguay's preparations suffered a setback as they went down 2-1 to Republic of Ireland in Dublin.
The South Americans, who are in one of the easier-looking groups at the World Cup alongside holders Italy, New Zealand and Slovakia, went behind in the seventh minute to Kevin Doyle's effort.
Liam Lawrence doubled the hosts' lead (39), although Paraguay did improve after the break and Lucas Barrios pulled one back (58).
And the United States left coach Bob Bradley with some tough decisions after his fringe players fell 4-2 to Czech Republic in Connecticut.
Maurice Edu's early opener was cancelled out just before half time by Tomas Sivok's strike. Jan Polak then put the visitors ahead after some slack marking by the Americans and although Herculez Gomez equalised in the 66th minute, Martin Fenin and Tomas Necid both scored to secure victory.