Jack Oosterlaak
Jack Oosterlaak ( Justus Kinloch Ayres Oosterlaak ;) ( born January 15, 1896 † June 5, 1968 ) was a South African sprinter.
At the Olympic Games in Antwerp in 1920, he won the South African team silver in the 4 x 400 - meter relay. About 200 meters he finished sixth, over 100 m, he reached the semi-finals, and in the 4 x 100 - meter relay, he retired with the South African team in the lead.