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Graterol (hamstring) threw a 30-pitch bullpen session Wednesday, Bill Plunkett of The Orange County Register reports.

Graterol threw his first bullpen session Saturday, and he appears to have already built up to a proper reliever's workload. The 26-year-old remains on track to begin a rehab assignment over the weekend, though it's still unclear how many minor-league innings he'll need to pitch before returning to Los Angeles' bullpen.

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