Adon, 23, pitched for the Nationals last season and had a good showing in the Minors. The Nationals’ starting pitcher threw 98 pitches in 5.1 innings and limited the Reds to three runs on four hits. In addition to her fastball, which sits in the mid-90s, Adon has a good slider, which serves as a strikeout pitch and generates late movement and swings and misses.