A native of Mazatlan, Osuna was signed by Atlanta as an undrafted 16-year-old free agent in 2004. He ultimately began his minor league career in 2006 with the Braves’ rookie team in the Gulf Coast League. Osuna worked his way up the Atlanta system, splitting the 2009 season between Myrtle Beach of the Class A Carolina League and Mississippi of the Class AA Southern League. Overall, his minor league career record is 22-19 with a 3.38 ERA in four years. Baseball America ranked Osuna as Atlanta’s 17th best prospect last year.
Osuna spent time this winter pitching for Mazatlan, posting a 2-0 record and 1.80 ERA in 16 appearances for the Venados before the Royals shut him down.