Red Sox's Alex Bregman
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Mayer came into the season as the No. 3 Red Sox prospect and the No. 28 prospect in baseball, according to The Athletic's Keith Law.
Masataka Yoshida took a big step toward returning to the Red Sox on Wednesday. But another position player had a setback and won't be back as soon as once thought.
The Boston Red Sox, who have been without an everyday first baseman since Triston Casas suffered a season-ending injury, have found a potential replacement.