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_90 (round INTEGER, player VARCHAR, pick VARCHAR)
### Question:
What round was the player Ty Lawson with a pick earlier than 18?
### Answer:
SELECT AVG(round) FROM table_name_90 WHERE player = "ty lawson" AND pick < 18