The Phillies used an opener strategy with left-hander Tim Mayza for two scoreless innings, followed by right-hander Brian Keller, who made his major league debut with three innings of one-run ball.
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Despite that, the team lost its 11th straight game started by the No. 5 rotation spot.
"Yeah, it hasn't been our best," Turner said. "We know that we want to play better.
I think it's just kind of going back to what Donnie said early on when he got the job: 'It's just three hours of competing, and don't let your foot off the gas.'"
Mattingly reflected on the team's offensive struggles.
"When you hit a stretch where you're not playing good, you're running into some good teams and you're not scoring, it makes it tough.
It doesn't mean we can't beat them, right? It just means we got to get going again."
Keller, who pitched three innings in his MLB debut after seven years in the minors, a stint in Japan, and Tommy John surgery, said, "It was amazing.
Dream come true. You picture it over and over.
You picture it going well; you picture it going poorly, unfortunately. But I'm glad it turned out all right.
I was surprisingly calm out there. Yeah, just really happy."
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The Phillies scheduled Cristopher Sánchez to start the series finale on Sunday night in an effort to avoid a sweep.