The Diamondbacks placed Castro on the 15-day injured list Tuesday, retroactive to April 21, with right shoulder inflammation.
Advice: Castro will undergo an MRI on his right shoulder Wednesday, Theo Mackie of The Arizona Republic reports. The reliever was dealing with discomfort for a bit, but it seems to have gradually gotten worse. He surrendered two runs on four hits across one inning during his last appearance Saturday. The 29-year-old is eligible to return May 7 against the Reds. In a corresponding move, Andrew Saalfrank was recalled from Triple-A Reno.
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