The Angels also acquired speedy triple-A outfielder
Thatcher, 32, had a 1-0 record and 2.63 earned-run average in 37 games for Arizona, striking out 25 and walking just three in 24 innings and holding left-handers to a .241 average.
He doesn't throw hard — his fastball sits in the 86-mph range, and he compliments it with a slider — but his sidearm delivery can be difficult for hitters to pick up.
The Angels will pay about $1.1 million of Thatcher's $2.375-million contract and he will be a free agent after this season.
Thatcher has held left-handers to a .221 average over an eight-year career in which he is 9-12 with a 3.26 ERA in 346 games, most of them with the
The acquisition of Thatcher marks the third time in seven days that the Angels have made a trade for a reliever. They acquired closer
Borenstein, 23, a 23rd-round draft pick of the Angels in 2011, was named the California League most valuable player in 2013 after he hit .337 with 28 home runs and 95 runs batted in for Class-A Inland Empire. He was also named the Angels' minor league player of the year.
He has split time this season between triple-A Salt Lake and double-A Arkansas, hitting .256 with two homers and 22 RBIs in 30 games for Salt Lake and .266 with five homers and 28 RBIs in 48 games for Arkansas.