CHICAGO -- Cubs shortstop Starlin Castro is back at work.
Castro, 20, has reported to the Leones de Escogido in the Dominican Winter League and was expected to play his first game Saturday or Sunday. Former Cubs outfielder Moises Alou is Escogido's general manager.
Castro is playing without any restrictions from the Cubs.
"I came to work on my defense, primarily on my throw to first base," Castro said.
The shortstop batted .300 in 125 games with the Cubs in his rookie season, hitting three home runs, including a three-run shot in his first at-bat May 7. He also committed 27 errors, and Cubs coach Ivan DeJesus and Minor League infield instructor Franklin Font were expected to visit Castro in the Dominican Republic this offseason to work on his defense.
Castro will find out Monday how he finished in the National League Rookie of the Year balloting by the Baseball Writers Association of America.
Carrie Muskat is a reporter for MLB.com. She writes a blog, Muskat Ramblings, and you can follow her on Twitter @CarrieMuskat This story was not subject to the approval of Major League Baseball or its clubs.