Sinker set Perdomo straight after early struggles

Luis Perdomo tosses seven strong innings, allowing just two runs on four hits and one walk while striking out three vs. the NationalsSAN DIEGO -- A month and a half into his big league career, Luis Perdomo was pitching like he belonged in Double-A, completely overmatched by the Major League hitters he was facing for the first time with San Diego.

To be fair, Perdomo probably did belong in Double-A. The 23-year-old right-hander had never pitched above Class A Advanced before he was selected in the Rule 5 Draft last December. But because of his Rule 5 status, the Padres had to keep him on their active roster for the entire season or surrender him back to the Cardinals.

So regardless of where he…