CREATE TABLE table_name_68 (attendance INT, opponent VARCHAR, score VARCHAR)

What is the average attendance when Brewers are the opponent with a score of 6 3?
SELECT AVG(attendance) FROM table_name_68 WHERE opponent = "brewers" AND score = "6–3"
SELECT AVG("attendance") FROM "table_name_68" WHERE "6–3" = "score" AND "brewers" = "opponent"