SEATTLE, July 12 (UPI) -- The Seattle Mariners optioned lefthander Matt Thornton to Class AAA Tacoma of the Pacific Coast League on Monday.
Thornton, 27, was 0-2 with a 6.35 ERA in three appearances for Seattle.
Making his first major league start against the Chicago White Sox on July 10, the Michigan native surrendered three runs, three hits and seven walks in five innings of a 3-2 loss.
A 1998 first-round selection of the Mariners, Thornton was 6-4 with a 6.00 ERA in 13 starts for Tacoma prior to his promotion.
Also, catcher Miguel Olivo, on the disabled list since July 1, is scheduled to play in games Tuesday and Wednesday with Everett of the Class A Northwest League as part of his rehabilitation assignment.
Acquired on June 27 in the deal that sent pitcher Freddy Garcia to the White Sox, Olivo played one game for Seattle before undergoing surgery to remove kidney stones on June 29.