Which Margin of victory has a Tournament of u.s. senior open?
CREATE TABLE table_75765 (
    "Date" text,
    "Tournament" text,
    "Winning score" text,
    "Margin of victory" text,
    "Runner(s)-up" text
)
SELECT "Margin of victory" FROM table_75765 WHERE "Tournament" = 'u.s. senior open'
Below are sql tables schemas paired with instruction that describes a task. Using valid SQLite, write a response that appropriately completes the request for the provided tables. ### Instruction: Which Margin of victory has a Tournament of u.s. senior open? ### Input: CREATE TABLE table_75765 (
    "Date" text,
    "Tournament" text,
    "Winning score" text,
    "Margin of victory" text,
    "Runner(s)-up" text
) ### Response: SELECT "Margin of victory" FROM table_75765 WHERE "Tournament" = 'u.s. senior open'