The league said Friday night in a release that Calathes tested positive for tamoxifen. The suspension begins Saturday night when the Grizzlies take on Oklahoma City in Game 1 of their first-round playoff series.
Yahoo Sports was the first to report the suspension.
Calathes, a 25-year-old rookie reserve, averaged 4.9 points and 2.9 assists in 71 games this season.
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