CHICAGO -- Jemile Weeks was injured during the first play of his first game on a Major League field Tuesday, as his Class A Kane County Cougars played the Peoria Chiefs in the first Minor League game at Wrigley Field.
Weeks tripped over first base while hustling out a ground ball, landing face-first in the infield dirt. The A's first selection in the 2008 First-Year Player Draft threw off his helmet in pain as the Cougars training staff rushed out to help him.
"I think it's a hip flexor, but I don't know the extent of the injury or how bad it is," Kane County manager Aaron Nieckula said after the game. "We're going to take him in for an MRI, be re-evaluated tomorrow."
The 21-year-old walked off the field under his own power to applause from the record crowd at Wrigley Field. He was replaced by Michael Richard in the bottom of the first inning.
"It looked like it was pretty bad, but he was able to put weight on it and walked up the stairs under his own power," Nieckula said. "He's a limber guy, pretty flexible. When he hit the bag, it might have popped."
The infielder was excited on the field before the game with the expectation that his mother and sister would be in the stands.
The 11th overall selection in June, the University of Miami star made his professional debut with the Cougars on July 9. Weeks was hitting .301 with one home run and eight RBIs through 18 games.
Bryan Smith is a contributor to MLB.com. This story was not subject to the approval of the National Association of Professional Baseball Leagues or its clubs.