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Jansen (hamstring) threw a successful live batting practice session Saturday and believes he'll be available out of the bullpen Sunday, Ian Browne of MLB.com reports.

Jansen was pulled from his outing Wednesday against the Astros with tightness in his right hamstring, but he's remained confident about avoiding the injured list. That optimism appears justified, though the Red Sox themselves haven't officially announced when he'll be available.

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