[1] He was added to the Cincinnati Reds 40 man roster after the 2009 season to protect him from the Rule 5 draft.

[2] Despite owning a 2.09 ERA in 9 games, Del Rosario allowed 13 hits in just 8 innings of work while also walking 4 batters.

On September 16, 2010, Del Rosario was traded to the Houston Astros for cash considerations and added to the 40-man roster.

Del Rosario was outrighted to the Astros' Triple-A affiliate Oklahoma City RedHawks on July 28, 2012.

[5] Del Rosario was designated for assignment by the Astros on October 26, 2012, when Che-Hsuan Lin was claimed off waivers from the Boston Red Sox.