Tennessee: - Tennessee Smokies placed RHP Marcos Mateo on the 7-Day disabled list. - Tennessee Smokies activated LHP Jeremy Papelbon from the 7-Day disabled list. Peoria: - Nelson Perez assigned to Peoria Chiefs from Daytona Cubs. - Charles Thomas assigned to Peoria Chiefs from AZL Cubs. - Yohan Gonzalez assigned to Peoria Chiefs from Boise Hawks. - George Matheus assigned to Cubs Extended Spring Training from Peoria Chiefs. - Andres Quezada assigned to Cubs Extended Spring Training from Peoria Chiefs. BA: Released: RHP Toby Matchulat Optioned to Triple-A: RHP Jeff Gray, 1B Chad Tracy Option transferred: RHP Marcos Mateo (Triple-A to Double-A) Added to 40-man roster: SS Starlin Castro Placed on 7-day DL: RHP Corey Martin, RHP Mike Parisi, RHP David Patton, C Mark Johnson Reinstated from DL: RHP Corey Martin, RHP Jon Nagel, OF Brandon Guyer In a quality middle-infield rookie class, Castro stands above the fray. The 20-year-old hasn't missed a beat since his promotion from Double-A, batting .364/.417/.636 with a double, a triple and a home run in six games with the Cubs. Other rookie middle infielders of note: Alcides Escobar, Ian Desmond, Scott Sizemore and Reid Brignac