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Former player James Thrash felt the discipline for Garrett was warranted.
A 2017 No. 1 overall draft pick, Garrett made the case for his suspension being reduced on Tuesday in New York to Thrash, jointly appointed by the league and NFLPA to hear player appeals.
The loss of Garrett is a significant setback to the Browns, who are trying to end a postseason drought dating to 2002.
Thrash also reduced the suspension for Steelers center Maurkice Pouncey from three games to two for punching and kicking Garrett following the shocking assault on Rudolph.
The Browns visit the Steelers on Dec. 1.