Big Jeff Pfeffer
- Given Name
- Francis Xavier
- Born
- 3/31/1882 — Champaign, IL, USA
- Died
- 12/19/1954 — Kankakee, IL, USA
- Weight
- 185 lbs
- Height
- 6' 1"
- Throws
- R
- Bats
- R
- Team(s)
- Chicago Cubs (1905–1910)Boston Beaneaters (1906)Boston Doves (1907–1908)Boston Rustlers (1911)
- Debut
- 1905-04-15
- Final Game
- 1911-10-09
20-Loss Season
1906 · Boston BeaneatersW13L22ERA2.95WHIP1.27