A workhorse who pitched 316 innings as a rookie in 1909, Mattern twice won 16 games for Braves teams that were losing over 100 games and leading the league in errors in four of his five seasons. In 1910 Mattern pitched six shutouts.
A workhorse who pitched 316 innings as a rookie in 1909, Mattern twice won 16 games for Braves teams that were losing over 100 games and leading the league in errors in four of his five seasons. In 1910 Mattern pitched six shutouts.
