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The Astros officially selected Alvarez's contract from Triple-A Round Rock ahead of Sunday's game against the Orioles. He'll serve as Houston's designated hitter and bat fifth, Brian McTaggart of MLB.com reports.

The slugger will make his highly anticipated MLB debut in the heart of the Houston lineup after a dazzling two months at Round Rock. Over 56 games in the Pacific Coast League, Alvarez slashed .343/.443/.742 with 23 home runs while striking out in a manageable 19.8 percent of his plate appearances. Barring monumental struggles in his first taste of the big leagues, there's a good chance the 21-year-old sticks in Houston for the long haul, making him a must-roster player in just about every format.

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