On September 4, 1906, the New York Highlanders defeated the Boston Americans, 1-0, at Huntington Avenue Grounds in Boston. This game ended a streak in which New York played five consecutive doubleheaders in six days. Impressively, the Highlanders swept all of the twin bills, posting a record of 10-0 during the run.

Quite a streak..
v
Indeed. All the more impressive when you consider how exhausted they must have been.