Grotz had his contract selected from Double-A Arkansas on Wednesday.

Grotz will provide the Mariners with a fresh bullpen arm after the team traded away a pair of relievers Wednesday. The right-hander owns a solid 2.51 ERA, 1.01 WHIP and 69:11 K:BB in 57.1 innings with Arkansas this season, though he's never pitched above Double-A, so expectations should be tempered for his first big-league stint.

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