CREATE TABLE table_name_15 (attendance NUMBER, opponent VARCHAR2, date VARCHAR2)

How low is the Attendance that has an Opponent of devil rays and a Date of may 13?
SELECT MIN(attendance) FROM table_name_15 WHERE opponent = "devil rays" AND date = "may 13"
SELECT MIN("attendance") FROM "table_name_15" WHERE "date" = "may 13" AND "devil rays" = "opponent"