During the Phillies’ 127-year existence as a member of the National League, that had lead the league in ERA only four times, being done by just three men.
The first Phil to lead the lead in ERA was Dan Casey, who led the NL in 1887 with an ERA of 2.86. The second Phil to have the lowest ERA was Hall of Fame Grover Cleveland Alexander who did so during his pitching triple crown seasons of 1915 (1.22), when he help lead the Phils to their first NL pennant, and 1916 (1.55). The third, and at the moment, last Phil to lead the NL in ERA was Hall of Famer Steve Carlton, who did it during his pitching triple crown year of 1972 with an ERA of 1.97.
Of the three Phils to lead the National League, two of them (Alexander and Carlton) are in the Hall of Fame. Of the four time that a Phil led the league, it was done once in the 19th Century and three times in the 20th Century. Grover Cleveland Alexander had the lowest ERA, with his 1.22 in 1915, while Dan Casey had the highest with his 2.86 in 1887.
Who is the most likely Phil who is most likely to next lead the NL in ERA? More than likely it would be Roy Halladay, although Cliff Lee is also likely to do it.