Chris Hatcher makes his debut as a major league pitcher, pitching a perfect inning for the Marlins as they defeat the Cubs, 13 – 3, at Wrigley Field. Hatcher’s first outing on the mound comes the year after he played his first major league game as a catcher; Art Doll, with the Boston Bees in 1936 was the last person to debut as a pitcher the year after breaking into the big leagues as a catcher.

On July 16, 2011 Chris Hatcher makes his debut as a major league pitcher, pitching a perfect inning for the Marlins as they defeat the Cubs, 13 – 3, at Wrigley Field. Hatcher’s first outing on the mound comes the year after he played his first major league game as a catcher; Art Doll, with the Boston Bees in 1936 was the last person to debut as a pitcher the year after breaking into the big leagues as a catcher.

Source
Baseball Reference July 16