Who was the Runner-up for the merrill lynch/golf digest commemorative pro-am tournament?
CREATE TABLE "senior_pga_tour_wins_9" (
  "date" text,
  "tournament" text,
  "winning_score" text,
  "margin_of_victory" text,
  "runner_s_up" text
);
SELECT "runner_s_up" FROM "senior_pga_tour_wins_9" WHERE "tournament"='merrill lynch/golf digest commemorative pro-am';