CREATE TABLE table_name_5 (top_25 INTEGER, top_10 VARCHAR(255), events VARCHAR(255), tournament VARCHAR(255))
What is the lowest for top-25 with events smaller than 42 in a U.S. Open with a top-10 smaller than 5?
    
SQL: SELECT MIN(top_25) FROM table_name_5 WHERE events < 42 AND tournament = "u.s. open" AND top_10 < 5