Zack Cozart (elbow) leaves game

CINCINNATI -- Reds rookie shortstop Zack Cozart hyperextended his left elbow while trying to make a tag in the fourth inning against Atlanta on Saturday, forcing him from the game in severe pain.

Atlanta pitcher Derek Lowe bunted with Nate McLouth on first base and no outs. First baseman Joey Votto fielded and threw to second, where Cozart tried to catch the ball and tag the sliding McLouth simultaneously. Cozart's left elbow extended backward from the impact.

He lost his glove and fell to the ground immediately, grabbing the elbow. He covered his face with his right hand while a trainer examined the elbow, then walked off the field cradling the arm. Edgar Renteria took his place.

X-rays were negative. There was no immediate word about whether he go on the disabled list.

"That's unfortunate, especially for a young guy who was playing well," Reds manager Dusty Baker said.

Cozart was promoted to the majors for the first time on July 7. He hit safely in his first seven games, providing a boost at a troublesome position. The Reds started the season with Paul Janish as the primary starter, but he struggled to hit and was demoted to Triple-A.

Renteria was signed in the offseason but also has disappointed, batting .232 with one homer and 14 RBIs. The Reds had Orlando Cabrera as their primary shortstop last season, when they won the NL Central, but declined to pick up his $4 million option.

Information from The Associated Press was used in this report.