CREATE TABLE table_31076 ("Week of" CLOB, "Tournament" CLOB, "Champion" CLOB, "Runner-up" CLOB, "Semifinalists" CLOB, "Quarterfinalists" CLOB)

Who became the champion for the 1984 Grand Prix where Marty Davis was the runner-up?
SELECT "Champion" FROM table_31076 WHERE "Runner-up" = 'Marty Davis'
SELECT "Champion" FROM "table_31076" WHERE "Runner-up" = 'Marty Davis'