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Bart has been taking grounders at first base at the alternate training site and could be called up Friday, Andrew Baggarly of The Athletic reports.

Teams can now call up prospects without the player accruing a full year of service time. The Giants have said in the past that they want Bart to learn another defensive position before joining the major-league roster, and it turns out he's been working at first base with the club in West Sacramento. With no minor-league games this season, the 23-year-old could be at risk of stagnating in his development if he's not competing regularly in a live setting.

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