TAMPA, Fla. -- Texas Rangers right-hander Kumar Rocker , who struggled in his return from the injured list, was optioned to Triple-A Round Rock on Thursday.

Rangers manager Bruce Bochy said the decision was not about an error made by Rocker that led to a four-run third inning during Wednesday's loss to the Tampa Bay Rays .

After getting Junior Caminero to ground out, Rocker was slow to cover first base, allowing Jake Mangum to reach and Yandy Diaz to score. Rocker then put his head down in frustration and didn't notice Jonathan Aranda breaking from third and scoring while the pitcher's back was turned.

Bochy point out that the play could not happen, calling attention to Rocker's relative inexperience.

"You can't be late there, and then if you are, you can't forget the sit

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