Nunez, 24, spent the entire season on the Pirates' disabled list while recovering from right ankle surgery. He played only 14 games last season, all in the Minors as part of a rehab assignment, and combined to hit .273 with three doubles, a triple and five RBIs on his rehab assignment with the Gulf Coast League Pirates, Class A Bradenton and Double-A Altoona.
Signed by the Tigers as a non-drafted free agent on May 3, 2007, Nunez was picked by the Pirates in the Major League phase of the 2011 Rule 5 Draft and claimed off waivers by the D-backs on Oct. 26.
Nunez has spent six seasons in the Minor Leagues, none of them above Double-A. He owns a career .266/.321/.349 batting line with 26 doubles, 27 triples, 13 homers, 170 RBIs and 111 stolen bases in 478 games.