Hamilton 'tweaked' a calf muscle in the Reds' extra-inning loss to the Giants on Friday night, MLB.com's Mark Sheldon reports. "I don't if it was a cramp or strain of the calf. That's something we'll kind of define here now that the game's over," manager Bryan Price said. "And we'll see. I don't know if we'll be able to write up the lineup until tomorrow."