He was added to the Cincinnati Reds 40 man roster after the 2009 season to protect him from the Rule 5 draft. 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. He was designated for assignment on September 13, 2010.\n', '

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

In 2011, Del Rosario appeared in a career high 54 games for the Astros. His control was an issue, as he issued the same number of walks as strikeouts in 53 innings.\n', '

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