Boston Beaneaters pitcher Wiley Piatt lost both games of a doubleheader to the St. Louis Cardinals on June 25, 1903. Piatt pitched a complete game in each contest, making him the first pitcher in the 20th century to pitch two complete games in one day and lose them both. Fittingly, Piatt was known as “Ironman” to his teammates.
Wiley Piatt (public domain)