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BOSTON — Right-hander Brad Keller agreed to to a one-year contract with the Boston Red Sox, six days after he was cut by the Chicago White Sox. The 28-year-old was 0-2 with a 4.86 ERA in two starts and three relief appearances with the White Sox. He was designated for assignment on May 20 and elected free agency two days later. Keller was 38-53 with a 4.27 ERA for Kansas City in 114 starts and 36 relief appearances from 2018-23. Right-hander Zack Kelly was optioned to Triple-A Worcester.
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