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ST. LOUIS (AP) - Arizona pitcher Randy Johnson was put on the 15-day disabled list for the third time this season, sidelined Tuesday because of a sore back right before his scheduled start at St. Louis.
The Diamondbacks promoted 22-year-old rookie right-hander Yusmeiro Petit from Triple-A Tucson to pitch in Johnson's place.
The 43-year-old left-hander said he doesn't believe the injury is career-threatening.
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