[4] That was the only season in which he produced a losing record, and he had his highest earned run average with 3.54.

[6] He continued his dominance in the 1886 season, winning 30 games and again lowering his ERA, this time to 1.98,[1] good for second in the NL behind Henry Boyle of the St. Louis Maroons.

[8] Before the 1888 baseball season, he contracted typhoid fever and subsequently died in Philadelphia.

[1] For the 1888 season, the Quakers, Washington Nationals, New York Giants and Boston Beaneaters wore a black crepe on their left sleeves to commemorate Ferguson.

[9] In 1931, Wilbert Robinson rated Ferguson as the fifth-best player to that point in baseball history.