Rusney Castillo said he's been working this winter to shorten up his swing because of the faster pitching speeds he's seen in the major leagues, the Boston Herald reports.

Castillo said he's been working this winter to shorten up his swing because of the faster pitching speeds he's seen in the major leagues, the Boston Herald reports.

Analysis:

Castillo, who signed with Boston out of Cuba in Aug. 2014, still hasn't made a full adjustment to baseball in the United States and remains an enigma entering the 2016 season. Injuries have slowed his development, including his adjustment to higher-caliber pitching and the longer season in MLB. He's shown ability in short spurts and will be given a chance to start every day if he's healthy coming out of spring training.