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Keller cleared waivers Thursday and elected to become a free agent.
Keller was cast off the Red Sox's 40-man roster Tuesday after turning in a 5.84 ERA and 1.62 WHIP across 24.2 innings with the team. The 29-year-old elected free agency and re-signed with the Red Sox on a minor-league deal when he was DFA'd by Boston earlier in the month, though Keller seems likely to head elsewhere this time around.
