Josh Fields (hamstring) said his Tuesday bullpen session went well, mlb.com's Brian McTaggart reports.

Fields (hamstring) said his Tuesday bullpen session went well, mlb.com's Brian McTaggart reports.

Analysis:

Fields is seemingly just bothered by minor hamstring tightness, as the issue did not prevent him from throwing. He'll likely open the season in a middle relief role, with the Astros now sporting a bullpen that includes Chad Qualls, Luke Gregerson and Pat Neshek.