South Korea's Tom Kim, an emotional spark for the Internationals against the United States at the Presidents Cup, said he and partner Kim Si-woo were cursed at by rivals on Saturday.

MONTREAL—Tom Kim’s theatrical performance at the Presidents Cup may have worn thin with American fans. But according to Kim, it’s the U.S. side that crossed a line. Following a loss to Patrick Cantlay and Xander Schauffele on Saturday evening,