"I can't make any excuses for what I did tonight," he said. "It's one of those nights I didn't do my job at all. I put our team in the hole from the get-go. That hurts me and the team. There is no excuse.
"The ball came up in the middle of the plate. [The Padres] are whacking at it, too. That's unacceptable."
After Fister left the game, right-hander Blake Treinen and left-hander Matt Grace pitched a combined six innings, allowed one run and struck out seven batters.
Treinen was clearly at his best on this day, striking out six in four innings, his longest stint of the year.