CINCINNATI -- Reds rookie shortstop Zack Cozart came out of Saturday's 11-2 win over the Braves because of a hyperextended left elbow.
In the top of the fourth inning with a runner on first base, Braves pitcher Derek Lowe bunted toward first base. Joey Votto picked up the ball and fired to second base. The ball one-hopped into the back of baserunner Nate McLouth as he slid into Cozart's left arm.
Cozart immediately grabbed his elbow in obvious pain and was on the ground for several moments as he was looked over by assistant trainer Steve Baumann and manager Dusty Baker. Cozart walked off the field holding his left arm.
X-rays were negative on Cozart's elbow. It is not known how much time he might miss.
"I don't have a clue," Baker said. "He's getting an MRI now. We'll have to see. That was a very unfortunate injury, especially for a young man that is playing well with a bright future."
Edgar Renteria replaced Cozart and hit a two-run double to left field in his first at-bat as part of a three-run sixth. Renteria added an RBI single during a seven-run seventh.
In 11 games since his July 7 call-up from Triple-A Louisville to make his big league debut, Cozart is batting .307 with two home runs and three RBIs. He began his Major League career with a seven-game hitting streak.
On Saturday, Cozart was 0-for-1 with a sacrifice bunt.
Mark Sheldon is a reporter for MLB.com. Read his blog, Mark My Word, and follow him on Twitter @m_sheldon. This story was not subject to the approval of Major League Baseball or its clubs.