The loss snapped a six-game winning streak for the Phillies and wasted an outstanding effort from starter Jake Arrieta who tossed eight scoreless innings.
After an outstanding start to his big league career, Dominguez has struggled as of late. He is 0-1 with a 7.11 ERA over his last seven appearances, issuing seven walks and surrendering six hits over 6 1/3 innings.
Ahead 2-0 in the ninth, Dominguez surrendered a solo-shot to David Peralta, then gave up a double to Eduardo Escobar and a single to Steven Souza that evened the contest.
"I'm not blind," Phillies manager Gabe Kapler told reporters afterward (see video). "The reality is he's not pitching his best right now. But we are not wavering in our confidence in him whatsoever. We cannot wait to get him back out on the mound because we understand how good he is and the talent will prevail."
The Phillies threatened to add a run or two in the ninth with runners on the corners an no out, but the momentum was thwarted by a strikeout and a double play.
Austin Davis took the loss for the Phillies, surrendering a walk-off homer to Peralta in the 14th.
The Phillies turn to Nick Pivetta on Tuesday in an effort to get back in the win column. He'll oppose D-Backs righty Zach Greinke.
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