The Angels optioned Mayfield to Triple-A Salt Lake on Sunday.
Mayfield became the odd man out for the Angels with the team needing to open up a spot on the 26-man active roster for left-hander Kenny Rosenberg, who was recalled from Salt Lake to start Sunday's series finale in Seattle. During his two-day stay with the Halos, Mayfield went 0-for-3 with two strikeouts.