Pena, son of former All-Star catcher Tony Pena, was once viewed as the Royals' shortstop of the future, but he compiled just a .228 batting average in four big league seasons in Atlanta and Kansas City.
The 28-year-old then tinkered with being a right-handed reliever for part of the 2009 season and went 1-2 with a 2.33 ERA in 10 games (three starts) in the Royals' farm system, striking out 18 and walking six in 19 1/3 innings.
Pena became a free agent after the season and is now pitching for Aguilas of the Dominican Winter League, with whom he is 2-0 with a 5.14 ERA in 17 relief appearances.
Alden Gonzalez is a reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.