Sox trade Aardsma for young lefty

The Red Sox today traded reliever David Aardsma to the Mariners for lefthanded pitcher Fabian Williamson.

The 20-year-old Williamson was 4-3 with a 4.10 ERA and 67 strikeouts in 52.2 innings at Single-A Pulaski in 2008. He has 144 strikeouts in 124.1 innings for his career at the minor league level.

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