PHOENIX (AP) -Randy Johnson will undergo season-ending back surgery, Arizona Diamondbacks manager Bob Melvin said Friday.
It marks the second year in a row that the Big Unit has had an operation on his troublesome back. It will be the third back operation of his career.
``He tried to work his way through it,'' Melvin said, ``but it just didn't get any better.''
The 43-year-old left-hander was traded to the Diamondbacks from the New York Yankees in the offseason, and the four-time Cy Young Award winner made his way back to the rotation after extensive rehabilitation. He had several strong starts but struggled in his later outings, then he was diagnosed with a herniated disk.
Melvin said the operation would take place next Friday in Los Angeles.

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