Seboko earned 24th position in the Under-20 Men's 8km race in 24:54 and Mthembu finished 30th in 25:25, with Weitsz crossing the line in 26th place in the Junior Women's 6km battle.
In the Senior Men's 10km event, Elroy Gelant went out hard and led at the first corner, but he fell off the pace and settled for 43rd position.