Memphis Grizzlies point guard Nick Calathes has been suspended for 20 games for violating the NBA's anti-drug policy.
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.