The first shutout in American League history (during its time as a major league) is recorded as Watty Lee of the Washington Senators blanks the Boston Americans, 4 – 0.
On May 15, 1901 — The first shutout in American League history (during its time as a major league) is recorded as Watty Lee of the Washington Senators blanks the Boston Americans, 4 – 0.
Source:
Baseball Reference May 15