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The Astros optioned Martinez to Triple-A Sugar Land on Saturday, Matt Kawahara of the Houston Chronicle reports.
Martinez will be squeezed out of the Astros' bullpen in order to make room for Hector Neris, who signed with the team Thursday. With a 3.04 ERA and 1.21 WHIP through 50.1 innings, the 29-year-old Martinez remains a candidate to return to Houston's bullpen down the stretch.
