South Korea beat Ivory Coast in London
The Koreans, who face Argentina, Nigeria and Greece in Group B of the World Cup, went ahead after four minutes with a well-taken volley by Lee Dong-kook.
Captained by Manchester United midfielder Park Ji-sung, they weathered some Ivorian pressure before finishing strongly and completed the win with a late header by Kwak Tae-hwi.
Ivory Coast, who are up against Brazil, Portugal and North Korea in South Africa, sacked coach Vahid Halilhodzic after they were knocked out in the quarter-finals of the African Nations Cup.
They have been linked with Russia coach Guus Hiddink for the World Cup but were under the care of Kouadio Georges on Wednesday.
The Africans had a strong-looking team but though Chelsea striker Didier Drogba appeared dangerous he had only half-chances to feed on.