CREATE TABLE table_42945 ("Year" TEXT, "Venue" TEXT, "Champion" TEXT, "Country" TEXT, "Score" TEXT, "Runner-up" TEXT)

What player was the champion in the match where E.A. Lassen was the runner-up?
SELECT "Champion" FROM table_42945 WHERE "Runner-up" = 'e.a. lassen'
SELECT "Champion" FROM "table_42945" WHERE "Runner-up" = 'e.a. lassen'