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Dull was released by the Mariners on Friday, Triple-A Tacoma broadcaster Mike Curto reports.
Dull joined the M's on a minor-league deal in early May and appeared in 28 games for the Rainiers. The right-hander never found much success this season with a 6.06 ERA, 1.36 WHIP and 43:15 K:BB over 35.2 innings.
