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The addition of Espinosa gives the Angels an everyday second-base option, a void they've been seeking to fill this offseason. Johnny Giavotella and Cliff Pennington split time at the position last season, but Angels' second basemen as a group slashed just .235/.275/.345.
Moving Espinosa -- who is from Santa Ana, Calif., and went to Long Beach State University -- became more likely for the Nationals after the acquisition of center fielder Adam Eaton from the White Sox, which enables the Nats to move Trea Turner to shortstop.
McGowin was the Angels' No. 20 prospect, according to MLBPipeline.com. The 25-year-old was the organization's fifth-round selection in the 2013 Draft. In 27 starts split between Double-A Arkansas and Triple-A Salt Lake last season, he posted a 5.83 ERA and 1.56 WHIP in 142 innings.
Adams, also 25, was the Angels' eighth-round pick in the 2012 Draft. In 34 appearances between the Arizona Fall League (two games) and Double-A Arkansas (32 games), he posted a 3.05 ERA and 1.22 WHIP in 44 1/3 innings.
Manny Randhawa is a reporter for MLB.com. Follow him on Twitter at @MannyRsports This story was not subject to the approval of Major League Baseball or its clubs.