Astros manager Bo Porter announced Thursday reliever Josh Fields made the opening day roster.
Fields, who has never pitched in a major-league regular season game, is 0-1 with a 2.53 ERA and 1.50 WHIP in 11 spring outings. He has struck out nine and walked seven in 10 2/3 innings. Fields was a 2008 first-round pick of the Mariners.