The Astros got Melancon in the deal that sent Lance Berkman to the New York Yankees. The right-hander has been pitching for Round Rock since the trade.
Melancon made two appearances for the Yankees this year. He's spent most of the season in Triple-A, going 7-1 with seven saves and a 3.41 ERA.
Wright, who was recently moved from the bullpen into the rotation, is 1-2 with a 6.28 ERA this season.
Nelson Figueroa will take Wright's scheduled spot in the rotation on Saturday against the Pirates. Figueroa is 3-1 with a 3.38 in 21 appearances for Houston and Philadelphia this season.
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