SCHEMA:
CREATE TABLE table_name_34 (runner_s__up VARCHAR, margin_of_victory VARCHAR, tournament VARCHAR)
USER:
Which Runner(s)-up has a Margin of victory of 1 stroke, and a Tournament of world seniors invitational?

QUERY:
SELECT runner_s__up FROM table_name_34 WHERE margin_of_victory = "1 stroke" AND tournament = "world seniors invitational"