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_87 (wins INTEGER, tournament VARCHAR, top_5 VARCHAR)
### Question:
What is the average number of Wins in a PGA Championship with a Top-5 less than 2?
### Answer:
SELECT AVG(wins) FROM table_name_87 WHERE tournament = "pga championship" AND top_5 < 2