CREATE TABLE table_name_34 (runner_s__up VARCHAR(255), margin_of_victory VARCHAR(255), tournament VARCHAR(255))
Which Runner(s)-up has a Margin of victory of 1 stroke, and a Tournament of world seniors invitational?
    
SQL: SELECT runner_s__up FROM table_name_34 WHERE margin_of_victory = "1 stroke" AND tournament = "world seniors invitational"