What years did Buck O'Brien play?

Buck O'Brien played in Major League Baseball from 1911 to 1913.

Was Buck O'Brien a pitcher?

Yes. Buck O'Brien pitched in the major leagues, recording 29 wins and 204 strikeouts.

How many home runs did Buck O'Brien hit?

Buck O'Brien hit 0 career home runs with 20 hits.

What teams did Buck O'Brien play for?

Buck O'Brien played for 2 teams: the Boston Red Sox (1911–1913) and the Chicago White Sox (1913).

What were Buck O'Brien's career stats?

In 64 games, Buck O'Brien went 29-25 with a 2.62 ERA, 204 strikeouts, and 432.0 innings pitched.

What position did Buck O'Brien play?

Buck O'Brien played primarily as a pitcher, the position where he appeared in the most games.

How tall was Buck O'Brien and how much did he weigh?

Buck O'Brien was listed at 5 feet 10 inches and 188 pounds.

What was Buck O'Brien's career ERA?

Buck O'Brien finished with a 2.62 career ERA, going 29-25 with 204 strikeouts.

How many strikeouts did Buck O'Brien have?

Buck O'Brien recorded 204 career strikeouts.

Is Buck O'Brien in the Hall of Fame?

No. Buck O'Brien has not been inducted into the National Baseball Hall of Fame.

Buck O'Brien

Pitcher · Career Stats, Bio & Records (1911-1913)

Buck O'Brien was a pitcher who played in Major League Baseball from 1911 to 1913 for the Boston Red Sox and the Chicago White Sox, a span of 3 seasons. Across 64 career appearances, he went 29-25 with a 2.62 ERA and 204 strikeouts. His career Pitcher PIV — Baseball Data Hub's era-adjusted measure of pitching impact — is 1932.2.

W (Wins):: Games credited to a pitcher whose team took a lead it never surrendered while he was the pitcher of record.
ERA (Earned Run Average):: Earned runs allowed per nine innings pitched: (ER × 9) ÷ IP. The primary measure of pitching effectiveness.
SO (Strikeouts):: For a batter, times retired on a third strike; for a pitcher, batters retired on a third strike.
WHIP (Walks and Hits per Inning Pitched):: Baserunners allowed per inning: (BB + H) ÷ IP. Under 1.00 is elite.

Data updated October 15, 2026

W–L 29–25

ERA 2.62

WHIP 1.27

SO 204

Pitcher PIV 1932.2

Position: Pitcher
Bats / Throws: R / R
Height / Weight: 5'10" / 188 lb
Born: 5/9/1882 in Brockton, MA, USA
Died: 7/25/1959 in Boston, MA, USA
MLB Debut: 1911-09-09
Last Game: 1913-08-06

Full name: Thomas Joseph O'Brien

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Career Pitching Statistics

Buck O'Brien — Career Pitching Statistics
W	L	G	GS	CG	SHO	SV	IP	H	ER	HR	BB	SO	ERA	Pitcher PIV
29	25	64	54	36	4	0	432.0	391	126	3	159	204	2.62	1932.2

Career ERA 2.62 vs. league average 3.27 across their career seasons — 19.6% better than league average.

Season-by-Season Pitching

Pitching Career Arc

Click a stat to plot it across every season.

Buck O'Brien — Season-by-Season Pitching
Year	Team	Lg	W	L	G	GS	CG	SHO	IP	H	ER	BB	SO	ERA	Lg ERA	Pitcher PIV
1911	BOS	AL	5	1	6	5	5	2	47.2	30	2	21	31	0.38	3.37 (+89%)	588.7
1912	BOS	AL	20	13	37	34	25	2	275.2	237	79	90	115	2.58	3.36 (+23%)	726.8
1913	BOS	AL	4	9	15	12	6	0	90.1	103	37	35	54	3.69	3.07 (-20%)	1173.7
1913	CHA	AL	0	2	6	3	0	0	18.1	21	8	13	4	3.93	3.07 (-28%)	-557.0
Career · 4 seasons			29	25	64	54	36	4	432.0	391	126	159	204	2.62	—	1,932

Lg columns show the league average for that season, with the player's figure as a percentage above or below it. Career totals the seasons listed above.

Career Batting Statistics

Buck O'Brien — Career Batting Statistics
G	AB	R	H	2B	3B	HR	RBI	SB	BB	SO	AVG	OBP	SLG	OPS	PIV
64	143	6	20	3	1	0	8	0	9	40	.140	.191	.175	.366	-707

Career AVG .140 vs. league average .265 across their career seasons — 47.2% below league average.

Career OBP .191 vs. league average .332 across their career seasons — 42.6% below league average.

Career SLG .175 vs. league average .354 across their career seasons — 50.6% below league average.

Career OPS .366 vs. league average .686 across their career seasons — 46.7% below league average.

Season-by-Season Batting

Career Arc

Click a stat to plot it across every season.

Buck O'Brien — Season-by-Season Batting
Year	Team	Lg	G	AB	R	H	2B	3B	RBI	BB	SO	AVG	Lg AVG	Lg OBP	Lg SLG	Lg OPS	PIV
1911	BOS	AL	6	16	0	2	1	0	1	0	4	.125	—	—	—	—	0.0
1912	BOS	AL	37	94	4	13	1	1	6	6	27	.138	.268 (-49%)	.335 (-43%)	.358 (-53%)	.694 (-48%)	-707.4
1913	BOS	AL	15	30	2	5	1	0	1	3	9	.167	—	—	—	—	0.0
1913	CHA	AL	6	3	0	0	0	0	0	0	0	.000	—	—	—	—	0.0
Career · 4 seasons			64	143	6	20	3	1	8	9	40	.140	—	—	—	—	-707

Lg columns show the league average for that season, with the player's figure as a percentage above or below it. Career totals the seasons listed above.

Postseason Statistics

Playoff Career Batting

Buck O'Brien — Playoff Career Batting
G	AB	R	H	2B	3B	HR	RBI	BB	SO	AVG
2	2	0	0	0	0	0	0	0	2	.000

Playoff Batting by Year

Buck O'Brien — Playoff Batting by Year
Year	Round	Team	G	AB	R	H	2B	3B	HR	RBI	BB	SO	AVG
1912	WS	BOS	2	2	0	0	0	0	0	0	0	2	.000

Playoff Career Pitching

Buck O'Brien — Playoff Career Pitching
W	L	G	GS	SV	IP	H	ER	BB	SO	ERA
0	2	2	2	0	9.0	12	5	3	4	5.00

Playoff Pitching by Year

Buck O'Brien — Playoff Pitching by Year
Year	Round	Team	W	L	G	GS	SV	IP	H	ER	BB	SO	ERA
1912	WS	BOS	0	2	2	2	0	9.0	12	5	3	4	5.00

Game Log & Splits

View full game log (128 games) →

Per-game data from Retrosheet (regular season, through 2025).

Batting — Home / Away

Buck O'Brien — Batting — Home / Away
Split	G	AB	R	H	HR	RBI	AVG
Home	32	68	6	12	0	6	.176
Away	32	74	0	8	0	1	.108

Pitching — Home / Away

Buck O'Brien — Pitching — Home / Away
Split	G	IP	H	ER	BB	SO	ERA
Home	32	221.1	209	62	95	114	2.52
Away	32	210.0	182	57	66	93	2.44

Last 10 Games — Batting

Buck O'Brien — Last 10 Games — Batting
Date	Tm	Opp	Res	AB	R	H	2B	BB	SO
1913-08-06	CHW	MIN	L	0	0	0	0	0	0
1913-07-29	CHW	BOS	L	1	0	0	0	1	1
1913-07-26	CHW	BOS	L	0	0	0	0	0	0
1913-07-23	CHW	MIN	L	0	0	0	0	1	0
1913-07-16	CHW	PHA	W	0	0	0	0	0	0
1913-07-11	CHW	NYY	L	1	0	0	0	0	0
1913-06-28	BOS	NYY	L	1	0	0	0	0	0
1913-06-19	BOS	DET	W	3	1	1	1	1	0
1913-06-13	BOS	SLA	W	2	0	0	0	1	1
1913-06-04	BOS	CHW	L	0	0	0	0	0	0

Last 10 Games — Pitching

Buck O'Brien — Last 10 Games — Pitching
Date	Tm	Opp	Dec	IP	H	R	ER	BB	SO
1913-08-06	CHW	MIN	—	0.2	1	3	3	1	0
1913-07-29	CHW	BOS	L	6.0	4	5	2	7	1
1913-07-26	CHW	BOS	—	1.0	0	0	0	0	2
1913-07-23	CHW	MIN	—	3.0	2	1	0	1	1
1913-07-16	CHW	PHA	—	2.2	6	3	3	1	0
1913-07-11	CHW	NYY	L	5.0	8	4	3	3	0
1913-06-28	BOS	NYY	—	3.1	3	1	0	2	1
1913-06-19	BOS	DET	—	8.0	10	4	4	5	3
1913-06-13	BOS	SLA	—	8.0	9	6	6	7	3
1913-06-04	BOS	CHW	L	2.0	4	3	3	2	2

Fielding Statistics

Career Fielding Totals by Position

Buck O'Brien — Career Fielding Totals by Position
Position	G	GS	PO	A	E	DP
P	64	0	15	130	5	2

Season-by-Season Fielding

Buck O'Brien — Season-by-Season Fielding
Year	Team	Pos	G	PO	A	E	DP
1911	BOS	P	6	3	14	0	1
1912	BOS	P	37	10	83	5	1
1913	BOS	P	15	1	29	0	0
1913	CHA	P	6	1	4	0	0

Career Games by Position

Position Diamond

Circle size = games played at each position.

Buck O'Brien — Career Games by Position
Position	Games
Pitcher	64

Most Similar Players

Career comps based on counting + rate stats and primary position. Score is relative — closest peer anchors at ~98%.

Career Spans

Buck O'Brien (highlighted) compared to peers across the same era.

Buck O'Brien: the record in brief

Buck O'Brien's major league career runs from a debut on September 9, 1911 to a final game on August 6, 1913. The team column moves through the Boston Red Sox (1911 through 1913) and the Chicago White Sox (1913). The bio lists O'Brien as a pitcher who both batted and threw right-handed. Height and weight on file: 188 pounds on a 5-foot-10 frame. The birth record reads May 9, 1882, in Brockton, MA, USA. O'Brien died on July 25, 1959, in Boston, MA, USA. Buck O'Brien was the playing name; the full given name is Thomas Joseph.

The pitching table credits O'Brien with a 29-25 record and a 2.62 ERA in 64 games. The totals include 204 strikeouts and 36 complete games. Against a 3.27 league ERA for the same years, O'Brien was 19.6% better. O'Brien won 20 games in 1912, the most of any season listed. Among the heaviest workloads, the lowest ERA was 2.58 in 1912, when the league's was 3.36.

Frequently Asked Questions about Buck O'Brien

What years did Buck O'Brien play?: Buck O'Brien played in Major League Baseball from 1911 to 1913.
Was Buck O'Brien a pitcher?: Yes. Buck O'Brien pitched in the major leagues, recording 29 wins and 204 strikeouts.
How many home runs did Buck O'Brien hit?: Buck O'Brien hit 0 career home runs with 20 hits.
What teams did Buck O'Brien play for?: Buck O'Brien played for 2 teams: the Boston Red Sox (1911–1913) and the Chicago White Sox (1913).
What were Buck O'Brien's career stats?: In 64 games, Buck O'Brien went 29-25 with a 2.62 ERA, 204 strikeouts, and 432.0 innings pitched.
What position did Buck O'Brien play?: Buck O'Brien played primarily as a pitcher, the position where he appeared in the most games.
How tall was Buck O'Brien and how much did he weigh?: Buck O'Brien was listed at 5 feet 10 inches and 188 pounds.
What was Buck O'Brien's career ERA?: Buck O'Brien finished with a 2.62 career ERA, going 29-25 with 204 strikeouts.
How many strikeouts did Buck O'Brien have?: Buck O'Brien recorded 204 career strikeouts.
Is Buck O'Brien in the Hall of Fame?: No. Buck O'Brien has not been inducted into the National Baseball Hall of Fame.