Jack Leiper

Born: 12/23/1867 in Chester, PA, USA

Died: 8/23/1960 in West Goshen, PA, USA

MLB Debut: 1891-09-04 | Final Game: 1891-10-04

Bats: L | Throws: L | Height: 5'11"

Full name: John Henry Thomas Leiper

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Biography

Jack Leiper, born in 1867, was a professional baseball pitcher whose career spanned the 1891 season. Competing during a transitional era in baseball, Leiper played at a time when the game was evolving from the deadball era to a more offensive style. He made his mark in the major leagues with a record of 2-2 and an earned run average (ERA) of 5.4 over his brief tenure. Though his career was short-lived, Leiper contributed to the teams he played for with a total of 19 strikeouts. His performance, while modest by today’s standards, reflected the challenges faced by pitchers of his time, as the game was marked by lower scoring and a focus on strategy and skill. Leiper's career, lasting from September 4 to October 4 in 1891, highlights the rich tapestry of early baseball history, illustrating the foundations upon which modern baseball was built.

Career Pitching Statistics

W	L	G	GS	CG	SHO	SV	IP	H	ER	HR	BB	SO	ERA	Pitcher PIV
2	2	6	5	4	0	0	45.0	41	27	3	39	19	5.40	0

Career ERA 5.40 vs. league average 3.52 across their career seasons — 53.4% worse than league average.

Season-by-Season Pitching

Year	Team	Lg	W	L	G	GS	CG	SHO	SV	IP	H	ER	BB	SO	ERA	Lg ERA	Pitcher PIV
1891	CL6	AA	2	2	6	5	4	0	0	45.0	41	27	39	19	5.40	3.52 (-53%)	-2150.4

Career Batting Statistics

G	AB	R	H	2B	3B	HR	RBI	SB	BB	SO	AVG	OBP	SLG	OPS	PIV
6	21	2	3	0	0	0	3	0	0	6	0.143	0.143	0.143	0.286	0.0

Career AVG .143 vs. league average .254 across their career seasons — 43.8% below league average.

Career OBP .143 vs. league average .332 across their career seasons — 56.9% below league average.

Career SLG .143 vs. league average .344 across their career seasons — 58.4% below league average.

Career OPS 0.286 vs. league average 0.675 across their career seasons — 57.7% below league average.

Season-by-Season Batting

Year	Team	Lg	G	AB	R	H	2B	3B	HR	RBI	SB	BB	SO	AVG	Lg AVG	Lg OBP	Lg SLG	Lg OPS	PIV
1891	CL6	AA	6	21	2	3	0	0	0	3	0	0	6	0.143	—	—	—	—	0.0

Fielding Statistics

Career Fielding Totals by Position

Position	G	GS	PO	A	E	DP
OF	1	0	1	0	0	0
P	6	0	3	8	3	1

Season-by-Season Fielding

Year	Team	Pos	G	GS	PO	A	E	DP
1891	CL6	OF	1	0	1	0	0	0
1891	CL6	P	6	0	3	8	3	1

Career Games by Position

Position	Games
Pitcher	6
Right Field	1