Red Sox closer Kenley Jansen needs to adapt to pitching rule changes
Sources - Red Sox, closer Kenley Jansen reach 2-year deal - ESPN
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Alex Cora: Optimistic about Kenley Jansen adapting to MLB's pitch clock
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Red Sox closer Kenley Jansen, one of the slowest workers in baseball, says he will adjust to MLB's new pitch clock - The Boston Globe
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Red Sox closer Kenley Jansen dealing with tight back, will not be available to pitch on Sunday – Blogging the Red Sox
Mastrodonato: Red Sox send important message with signing of All-Star closer Kenley Jansen