Though he started the season with the Triple-A Salt Lake Stingers, Shields was called up to the MLB on May 25, making his debut against Tampa Bay Rays on May 26, pitching one-plus innings and allowing one hit and one walk. He was optioned back to Salt Lake, but was recalled on June 27. In eight relief appearances with the Angels, Shields allowed eight hits and seven walks before being optioned back to Salt Lake, where he stayed for the remainder of the season.