Jack Mercer
- Given Name
- Harry Vernon
- Born
- 3/10/1889 — Zanesville, OH, USA
- Died
- 6/25/1945 — Dayton, OH, USA
- Height
- 5' 11"
- Throws
- R
- Team(s)
- Pittsburgh Pirates (1910)
- Debut
- 1910-08-02
- Final Game
- 1910-08-02
Box score · 1910 · Pittsburgh Pirates
Batting
AB0R0H02B03B0HR0RBI0BB0SO0SB0
Pitching
IP1.0H0ER0BB2SO1W0L0