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Rizzo hit a grounder to second baseman Jimmy Paredes in the third inning Tuesday night, and his throw to first was high, causing Wallace to jump to try and catch it. Rizzo collided with Wallace while he was in the air and tumbled violently to the ground.
He remained on the dirt for a minute while trainers looked at him. He finally sat up and slowly walked off the field with the help of the trainers.
Joe Mather came in to run for Rizzo, and moved to right field in the bottom of the third when Bryan LaHair switched to first base.
The Cubs are going to monitor Rizzo for the next couple of days, but they believe he will be OK.