CREATE TABLE table_68003 ("Date" TEXT, "Tournament" TEXT, "Winning score" TEXT, "Margin of victory" TEXT, "Runner ( s ) -up" TEXT)

What was the margin of victory when Mark Calcavecchia was the runner-up?
SELECT "Margin of victory" FROM table_68003 WHERE "Runner(s)-up" = 'mark calcavecchia'
SELECT "Margin of victory" FROM "table_68003" WHERE "Runner(s)-up" = 'mark calcavecchia'