The Los Angeles Angels traded right-hander Ryan Zeferjahn to the Chicago Cubs for designated hitter/catcher Moisés Ballesteros and right-handed pitcher Mason McGwire, the teams announced.
Zeferjahn's 13.1 K/9 ranks sixth in the majors among qualified big-league relievers, according to FanGraphs.
The hard-throwing Zeferjahn averages 97.5 mph with his fastball and features a sweeper that's held hitters to a .139 average this season.
Chicago's bullpen ranks sixth in the National League in ERA but sits ninth in strikeout percentage.
Ballesteros has appeared in 79 career big-league contests, slashing .249/.328/.408 with eight home runs and 34 RBIs. Primarily serving as a DH, he's caught only nine games in the majors.
McGwire is the son of former player Mark McGwire. The 22-year-old has pitched to a 3.64 ERA and 1.23 WHIP with a 10.9 K/9 in 59 1/3 minor-league innings this season.
