Marseille striker Jordan Ayem scored a hat trick after entering the game as a substitute Monday as Ghana won its warmup match for next week's World Cup by beating South Korea 4-0.

Ghana plays the United States next Monday in Natal, Brazil. The Black Stars eliminated the Americans from the World Cup in 2006 and 2010.

Forward Abdul Majeed Waris left the game in the fourth minute with a left leg injury and was replaced by Ayem, who scored in the 13th minute when his shot from 15 yards deflected off defender Ki Sung-yueng and past goalkeeper Jung Sung-ryong.

Ayem sent a strike into the corner of the net from 23 yards in the 53rd minute, and scored from close range in the 89th off a pass from Albert Adomah. (AP)