Both Robbie Stockdale and Allan Johnston started against South Africa in the three team Reunification Cup, Boro target Benni McCarthy also started for the South African's.
Scotland went behind after half an hour when a McCarthy free-kick was fumbled by the keeper and cleaned up by Mokoena.
Johnston and Stockdale were both substituted midway through the second half as the Scots put up a fight but the South Africans wrapped things up with an injury time goal from Koumantarakis.