Nate Adcock was chosen from Louisville to replace Jumbo Diaz in the bullpen.
Diaz, who was the losing pitcher on Saturday, after giving up a two-run, two-out single to Matt Kemp that was the final blow that sealed the Reds' 9-7 defeat.
At Louisville, Adcock pitched in 22 games. He was 0-2 with a 2.96 ERA with 11 saves in 16 chances.
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The Reds released RHP Matt Magill, who had elbow surgery on May 8 was released. Magill came to the Reds in a trade for Chris Heisey. He was 1-1 in three starts at Louisville before the injury.