Zambrano solid but had tired arm

Carlos Zambrano threw all of his pitches Thursday, but his arm felt tired. AP Photo/Matt York

MESA, Ariz. -- Chicago Cubs starter Carlos Zambrano pitched three shutout innings Thursday, complained about fatigue in his arm and refused to answer questions about the altercation between Carlos Silva and Aramis Ramirez.

"I can't comment on that. I wasn't there," Zambrano said of Wednesday's dugout confrontation.

I asked Zambrano whether he felt the team's concentration was good enough after making 15 errors in five games, including one Thursday against the Texas Rangers.

"We prepare as individuals for the season," Zambrano said. "We have a good team. Things happen in spring training, but when the season starts, we'll turn it around and start playing like we're supposed to play."

Cubs manager Mike Quade held a closed-door, clubhouse meeting on Thursday morning in response to the errors and altercation. Zambrano just worried about himself.

"I work on what I have to do and what I need to do to be ready," Zambrano said. "I don't worry about the offense or the defense, or what they need to do. I don't worry about other people, what they have to do to be ready for the season. It's not my concern."

Zambrano, who said he threw all his pitches, complained of a dead arm after throwing on just three days of rest. He said he felt his arm was tired.

"I threw everything today," he said. "My sinker -- good. I threw a good sinker to Endy Chavez, and he popped out. And my split-finger was good. I got a ground-ball double play."

Zambrano said his pitches dragged when he tried to throw a fastball. He was referring to something called "The Dead Arm Syndrome," which is when a pitcher builds up arm strength to a certain level and then hits a wall. It's customary at certain points during spring training.

"It sometimes happens at the beginning of spring training; it sometimes happens at the end," he said. "I just work hard. I'll come here tomorrow and do my cardio and get ready for my next start."

Zambrano has pitched five shutout innings in two spring starts.