The Red Sox claimed right-hander Sandy Rosario off of waivers from the Marlins, according to Clark Spencer of the Miami Herald (on Twitter).
Rosario, 27, appeared in four games with the Marlins this past season. He spent most of the year in the minor leagues, where he posted a 1.99 ERA with 8.2 K/9 and 1.4 BB/9 in 31 2/3 innings. Though he started two games, Rosario was mostly used in relief.
WEEI.com's Alex Speier confirmed that Rosario has one minor league option remaining, meaning the Red Sox can send him to Triple-A next season without having to pass him through waivers.