South Korea will form the backbone of the International team's hopes of upsetting the United States at the Presidents Cup with a record four players set to tee off on Thursday at the Quail Hollow Club.

Im Sung-jae, Kim Si-woo, Tom Kim and K.H. Lee make up one-third of Trevor Immelman's 12-man squad and will be counted on to produce points if the Internationals are to challenge the heavily favored Americans.

Two of those South Korean rookies, 20-year-old dynamo Tom Kim, the youngest player in this year's event, and Lee will join forces to take on the U.S. duo of Cameron Young and Collin Morikawa in Thursday's opening foursomes.