Hamilton experienced pain in his left knee Tuesday and flew to Houston to consult with his surgeon, Jeff Wilson of the Fort Worth Star-Telegram reports.
It's scary news for Hamilton, who underwent ACL surgery on the same knee last season. After progressing through the offseason without any setbacks, the 36-year-old felt a "tweak" while running the bases and immediately left for Houston. Hamilton has been trying to make a transition to first base in an effort to earn a spot on the opening day roster, but this could be a damaging hindrance to those aspirations.