 In 2002, pitched at the Triple-A level, and was a late-season call-up to the Padres, appearing in three MLB games while allowing four runs in innings (27.00 ERA).In October 2002, Shiell was claimed off of waivers by the Boston Red Sox.In 2003, he pitched for Boston at the Triple-A level, and made 17 MLB appearances (2–0 record with 4.63 ERA in innings).