Celtics acquire Xavier Tillman from Grizzlies

 Xavier Tillman (2) is headed to the Boston Celtics from the Memphis Grizzlies. (AP Photo/Nikki Boertman) BOSTON— The NBA-leading Boston Celtics added some depth at center on Wednesday, acquiring big man Xavier Tillman from the Grizzlies in exchange for forward Lamar Stevens and two future second-round draft picks. With the deal Boston adds some depth…

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