user: Question: What is Runner(s)-Up, when Margin of Victory is 1 stroke, and when Tournament is Joburg Open 1?
Columns: ['Date', 'Tournament', 'Winning score', 'Margin of victory', 'Runner(s)-up']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['12 Dec 2004', 'Dunhill Championship 1', '–7 (71-69-70-71=281)', 'Playoff', 'Neil Cheetham']
SQL:

assistant: SELECT "Runner(s)-up" FROM "Table" WHERE "Margin of victory" = '1 stroke' AND "Tournament" = 'Joburg Open 1';