SELECT "Attendance" FROM table_20558 WHERE "Date" = 'January 9, 1988'
How many were in attendance during the game on January 9, 1988?
CREATE TABLE table_20558 (
    "#" real,
    "Date" text,
    "at/vs." text,
    "Opponent" text,
    "Score" text,
    "Attendance" real,
    "Record" text
)