Below is an context that describes a sql query, paired with an question that provides further information. Write an answer that appropriately completes the request.  # noqa: E501
### Context:
CREATE TABLE table_name_21 (open_cup VARCHAR, reg_season VARCHAR)
### Question:
What open cup did they play in when they finished 2nd, northeast in the reg. season?
### Answer:
SELECT open_cup FROM table_name_21 WHERE reg_season = "2nd, northeast"