CREATE TABLE table_name_19 (margin_of_victory VARCHAR, runner_s__up VARCHAR)

Which Margin of victory has a Runner(s)-up of mark o'meara?
SELECT margin_of_victory FROM table_name_19 WHERE runner_s__up = "mark o'meara"
SELECT "margin_of_victory" FROM "table_name_19" WHERE "mark o'meara" = "runner_s__up"