"He had a low back spasms," said Cardinals manager Mike Matheny after the game. "So, it was better to get him out than try to pitch through it."
Matheny said that this is the first he's heard of any back problems from Weaver.
"We'll get him looked at and get him some medical attention and see where it is tomorrow," Matheny said.
Glenn Sattell is a contributor to MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.