The Diamondbacks signed Espinal to a minor-league contract Thursday.
Singer took a no-decision against the Cardinals on Thursday, allowing four runs on five hits and one walk in six innings. He struck out three.
The Reds outrighted Emanuel to Triple-A Louisville on Thursday.
Suarez is absent from the lineup for Thursday's game versus the Cardinals.
Bleday went 0-for-3 in Wednesday's 5-4 win over the Cardinals.
Nootbaar entered Wednesday's game as a pinch hitter and went 1-for-2 with a two-run home run in a 7-6 extra-inning victory over the Red Sox.
Arenado went 2-for-5 with an RBI and a run scored in Wednesday's 7-6 extra-inning win over Boston.
Pagan secured the save Wednesday against the Cardinals, allowing two runs on two hits and no walks in the ninth inning.
Stewart went 1-for-3 with a three-run home run and a walk in Wednesday's 5-4 win over the Cardinals.
Pfaadt didn't factor into the decision Wednesday against the Red Sox, allowing five runs on seven hits over 5.2 innings. He struck out eight.
