SAN DIEGO - Derek Jeter's "nightmare'' 2013 season -- his word -- keeps getting worse.

Starting with his first setback in spring training, the 39-year-old shortstop hasn't been able to stay on the field. He has played in only five of the Yankees' 110 games. And he could be headed back to the disabled list after an MRI taken here late Saturday revealed a grade 1 strain in his right calf.

Add that to the slow recovery from a broken left ankle and the right quadriceps strain that already has sidelined him nearly all season.

"I'm tired of trying to speculate," Jeter said of another possible DL stint. "It's frustrating, so we'll see what happens tomorrow. It's been terrible. It's been a nightmare. The whole season has been a nightmare. I really don't know what to tell you."

Jeter returned from the quad strain July 28 but felt discomfort in his calf the next day. He played both games in Los Angeles and in the first game of this series against the Padres, clearly not moving well in the field or on the bases Friday night.

Jeter did say this injury, which he said became more pronounced "when we got to L.A.," didn't seem the same as the grade 1 right calf strain that kept him out nearly three weeks in 2011.

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"It's different, because when I did it last time, I felt it. I was running to first base and I felt it," Jeter said. "This time I didn't feel it anything. It was later on that night and the next day."

Did favoring his left ankle cause the issues in his right leg?

"I don't know," Jeter said.

"All I can tell you about my ankle is that I don't feel it," he said. "So if I am doing it, it is not something I am conscious of."