The Seattle Mariners traded lefty Matt Thornton to the Chicago White Sox for outfielder Joe Borchard on Monday. The 29-year-old Thornton struggled last season with the Mariners, going 0-4 with a 5.21 ERA in 55 games. He has a 4.82 ERA in 74 career relief appearances with Seattle. "I's difficult to give up on a guy who throws 94 mph," Mariners manager Mike Hargrove said. "Things didn't work out for Matt here, but hopefully for him everything will come together for him in a different environment."