Stewart went 1-for-4 with a solo home run in Tuesday's 3-1 loss to the Giants.
Singer (5-12) allowed three runs on six hits, two walks and two hit batsmen while striking out five over 5.2 innings to take the loss versus the Giants on Tuesday.
Lawlar cleared concussion protocol following his removal from Tuesday's game against the Cubs, Alex Weiner of ArizonaSports.com reports.
Pfaadt allowed four runs on six hits, two walks and a hit batsman while striking out three over 6.2 innings in a no-decision versus the Cubs on Tuesday.
Waldschmidt went 1-for-1 with a two-run home run in Tuesday's 5-4 win over the Cubs.
Lawlar was removed from Tuesday's game against the Cubs after getting hit on the head by a pitch, Alex Weiner of ArizonaSports.com reports.
Kelly and the Diamondbacks believe that Cubs third-base coach Quintin Berry was stealing pitches and relaying signs to hitters in Monday's 7-0 loss, Alex Weiner of ArizonaSports.com reports. "Stealing signs is as old as baseball, I think it's a little [expletive] when it comes from the coach," Kelly said.
Waldschmidt is out of the lineup for Tuesday's matchup against the Cubs, per Alex Weiner of ArizonaSports.com.
Myers is not in the lineup Tuesday versus the Giants.
The Reds sent Ashcraft (elbow) to Triple-A Louisville to begin a rehab assignment.
