He also had a National League leading ERA of 1.96. Earned run average officially became a statistic of Major League Baseball in 1912, and Tesreau, along with the American League's Walter Johnson, became the first players recognized for leading the major leagues in that category. That season he also led the NL in hits per 9 innings pitched (6.566); he also led the league in that category in 1913 (7.085) and 1914 (6.645).
He also had a National League leading ERA of 1.96. Earned run average officially became a statistic of Major League Baseball in 1912, and Tesreau, along with the American League's Walter Johnson, became the first players recognized for leading the major leagues in that category. That season he also led the NL in hits per 9 innings pitched (6.566); he also led the league in that category in 1913 (7.085) and 1914 (6.645).