The Miami Marlins have designated right-hander John Maine for assignment in order to clear a spot on the 40-man roster for right-hander Tom Koehler, according to Joe Frisaro of MLB.com.
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Maine signed a free agent contract with the Marlins over the offseason. He appeared in four games for the club -- his first action in the bigs since 2010. It wasn't a pleasant return for the 31-year-old, as he surrendered 10 runs on 15 hits with five walks and seven strikeouts over 7 1/3 innings of work.
Previously an effective starter for the New York Mets, Maine underwent shoulder surgery in 2010 and hasn't been the same pitcher since. He came up as a top prospect in the Baltimore Orioles' farm system before he was traded to New York with Jorge Julio in exchange for Kris Benson -- and the former Mrs. Kris Benson.
Koehler appeared in eight games -- including one start -- for the Marlins last season. Over 13 1/3 innings, the 26-year-old allowed eight runs on 15 hits with two walks and 13 strikeouts. He spent a majority of the year with Miami's Triple-A affiliate, posting an ERA of 4.17 with a strikeout-to-walk ratio of 2.26 over 151 innings.