Goals from Asamoah Gyan, Sulley Muntari and Michael Essien steered Ghana to a 3-1 FIFA World Cup warm-up victory over fellow finalists Korea Republic on Sunday.
Korea Republic, at almost full strength compared to the reserve side that drew 0-0 with Norway on Thursday, went behind in the 35th minute when Gyan converted a penalty after Kim Jin-Kyu handled in the box.
The night became worse for the young Korean defender when he limped off clutching the back of his right leg early in the second half. Team physio Kim Hyun-Chul told reporters they would need an X-ray to determine the extent of the injury.
Midfielder Lee Eul-Yong equalised four minutes after the break with a stunning 30-yard effort for the 2002 FIFA World Cup semi-finalists.
But Chelsea midfielder Essien's power was too much for Korea's lightweight trio of Lee, Park Ji-Sung and Lee Ho and it was from his cross that Muntari nodded Ghana back in front in the 62nd minute. Essien made it 3-1 with a simple finish in the 81st.
"Attack, midfield, defence, there wasn't a single good point tonight," said the Koreans' Dutch coach Dick Advocaat. "Game by game our team play has been getting worse and that is very disappointing."
The Koreans launch their FIFA World Cup challenge against Group G opponents Togo in Frankfurt on 13 June. Ghana begin their campaign against Group E rivals Italy in Hanover on 12 June.