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Mazza (back) was activated off the 60-day injured list and designated for assignment Monday, Marc Topkin of the Tampa Bay Times reports.
Mazza had been out since late April with lower-back spasms. He's been on a rehab assignment for a full month but wasn't particularly good, posting a 4.85 ERA and 1.69 WHIP in 13 innings of work. His rehab window is now up, and the Rays determined he hadn't shown enough to be worth a 40-man roster spot, so he'll now be available for other teams to claim off waivers.
