What was the margin of victory for Isao Aoki when he was a runner-up?
CREATE TABLE "senior_pga_tour_wins_10" (
  "date" text,
  "tournament" text,
  "winning_score" text,
  "margin_of_victory" text,
  "runner_s_up" text
);
SELECT "margin_of_victory" FROM "senior_pga_tour_wins_10" WHERE "runner_s_up"='isao aoki';