Núñez was batting .228 in 60 games with Boston this season, his third in the organization. Last year, he hit .265 with 10 homers in 127 games, and also hit a three-run pinch-homer to help the Red Sox win Game 1 of the Series against the Los Angeles Dodgers.
Also Monday, right-hander Ryan Weber and first baseman Sam Travis were recalled from Triple-A Pawtucket, and righty Hector Velázquez was optioned to Pawtucket.
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