The Yankees acquired Lance Berkman from the Astros to serve as their designated hitter for the remainder of the season on Saturday. New York dealt right-handed pitcher Mark Melancon and Minor League infielder Jimmy Paredes to Houston. The Bombers also received cash as part of the trade. With Nick Johnson out indefinitely, the Yankees have used their designated-hitter spot as a revolving door of sorts, allowing manager Joe Girardi to spell his veterans without taking their bats completely out of the lineup. Read more: http://newyork.yankees.mlb.com/news..._id=12817804&vkey=news_nyy&fext=.jsp&c_id=nyy