CREATE TABLE table_40228 ("Date" TEXT, "Tournament" TEXT, "Winning score" TEXT, "Margin of victory" TEXT, "Runner ( s ) -up" TEXT)

What is Runner(s)-Up, when Margin of Victory is 1 Stroke, and when Tournament is Joburg Open 1?
SELECT "Runner(s)-up" FROM table_40228 WHERE "Margin of victory" = '1 stroke' AND "Tournament" = 'joburg open 1'
SELECT "Runner(s)-up" FROM "table_40228" WHERE "Margin of victory" = '1 stroke' AND "Tournament" = 'joburg open 1'