Diaz's contract was selected by the Padres on Friday.

Diaz started spring training as a non-roster invitee but was sent to minor-league camp in early March. However, he'll join the major-league roster after Chris Paddack was placed on the injured list for an unspecified reason. The Padres haven't yet announced who could start Monday if Paddack is unavailable, but Diaz could be an option to fill in as a starter.

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