San Diego Padres prospect Donavan Tate has been suspended 50 games following his second positive drug test.

The commissioner's office announced the penalty Tuesday. He will be given credit for 25 games already served while undergoing counseling for substance abuse. The rest of the suspension begins immediately.

The 20-year-old Tate was the third overall pick in the 2009 draft. He is on the roster at Class A Eugene, and has also played this season at Class A Fort Wayne. He is batting a combined .294 with seven RBIs and seven stolen bases in 17 games.