On Friday, Wood took the loss against the D-backs, going five innings and giving up five runs on five hits, including a two-run home run by Justin Upton.
"I think he was a little bit tired," Cubs manager Dale Sveum said. "I don't think the ball is coming out of his hand all that great. He walked the pitcher twice, didn't have any feel. I think that's a sign of a guy hanging on right now without a lot of stuff on the ball, no life. I don't even know if he got over 90 mph today."
Was Wood tired?
"I didn't feel like it," the left-hander said. "My arm's feeling good, but [Sveum] made the call, and you've got to support it."
Wood isn't hurt.
"I think the arm's just tired," Sveum said. "It happens this time of year to some people. The last day of the season, he might come out with a lot of life."