What years did Dan O'Brien play?

Dan O'Brien played in Major League Baseball from 1978 to 1979.

Was Dan O'Brien a pitcher?

Yes. Dan O'Brien pitched in the major leagues, recording 1 wins and 17 strikeouts.

How many home runs did Dan O'Brien hit?

Dan O'Brien hit 0 career home runs.

What was Dan O'Brien's career batting average?

Dan O'Brien batted .000 over his career, with 0 hits in 5 at bats.

What was Dan O'Brien's career ERA?

Dan O'Brien finished with a 5.90 career ERA, going 1-3 with 17 strikeouts.

How many strikeouts did Dan O'Brien have?

Dan O'Brien recorded 17 career strikeouts.

Dan O'Brien

Pitcher · Career Stats, Bio & Records (1978-1979)

Dan O'Brien was a pitcher who played in Major League Baseball from 1978 to 1979 for the St. Louis Cardinals, a span of 2 seasons. Across 13 career appearances, he went 1-3 with a 5.90 ERA and 17 strikeouts. His career Pitcher PIV — Baseball Data Hub's era-adjusted measure of pitching impact — is 396.1.

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 12, 2026

W–L 1–3

ERA 5.90

WHIP 1.86

SO 17

Pitcher PIV 396.1

Position: Pitcher
Bats / Throws: R / R
Height / Weight: 6'4" / 215 lb
Born: 4/22/1954 in St. Petersburg, FL, USA
MLB Debut: 1978-09-04
Last Game: 1979-09-28

Full name: Daniel Joques O'Brien

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Career Pitching Statistics

Dan O'Brien — Career Pitching Statistics
W	L	G	GS	CG	SHO	SV	IP	H	ER	HR	BB	SO	ERA	Pitcher PIV
1	3	13	2	0	0	0	29.0	43	19	1	11	17	5.90	396.1

Career ERA 5.90 vs. league average 3.84 across their career seasons — 53.4% worse than league average.

Season-by-Season Pitching

Pitching Career Arc

Click a stat to plot it across every season.

Dan O'Brien — Season-by-Season Pitching
Year	Team	Lg	W	L	G	GS	IP	H	ER	BB	SO	ERA	Lg ERA	Pitcher PIV
1978	SLN	NL	0	2	7	2	18.0	22	9	8	12	4.50	3.69 (-22%)	21.0
1979	SLN	NL	1	1	6	0	11.0	21	10	3	5	8.18	4.00 (-104%)	375.1
Career · 2 seasons			1	3	13	2	29.0	43	19	11	17	5.90	—	396

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

Dan O'Brien — Career Batting Statistics
G	AB	R	H	2B	3B	HR	RBI	SB	BB	SO	AVG	OBP	SLG	OPS	PIV
13	5	0	0	0	0	0	0	0	0	0	.000	.000	.000	.000	0

Career AVG .000 vs. league average .262 across their career seasons — 100.0% below league average.

Career OBP .000 vs. league average .327 across their career seasons — 100.0% below league average.

Career SLG .000 vs. league average .388 across their career seasons — 100.0% below league average.

Career OPS .000 vs. league average .715 across their career seasons — 100.0% below league average.

Season-by-Season Batting

Career Arc

Click a stat to plot it across every season.

Dan O'Brien — Season-by-Season Batting
Year	Team	Lg	G	AB	AVG	Lg AVG	Lg OBP	Lg SLG	Lg OPS	PIV
1978	SLN	NL	7	3	.000	—	—	—	—	0.0
1979	SLN	NL	6	2	.000	—	—	—	—	0.0
Career · 2 seasons			13	5	.000	—	—	—	—	0

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.

Game Log & Splits

View full game log (26 games) →

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

Batting — Home / Away

Dan O'Brien — Batting — Home / Away
Split	G	AB	R	H	HR	RBI	AVG
Home	8	2	0	0	0	0	.000
Away	5	3	0	0	0	0	.000

Pitching — Home / Away

Dan O'Brien — Pitching — Home / Away
Split	G	IP	H	ER	BB	SO	ERA
Home	8	14.0	27	14	6	10	9.00
Away	5	15.0	16	5	5	7	3.00

Last 10 Games — Batting

Dan O'Brien — Last 10 Games — Batting
Date	Tm	Opp	Res	AB
1979-09-28	STL	NYN	L	1
1979-09-26	STL	PHI	L	1
1979-09-18	STL	PHI	L	0
1979-09-08	STL	WSN	L	0
1979-08-31	STL	SDP	W	0
1979-08-11	STL	CHC	L	0
1978-10-01	STL	WSN	L	0
1978-09-29	STL	WSN	L	0
1978-09-26	STL	NYN	L	0
1978-09-20	STL	NYN	L	1

Last 10 Games — Pitching

Dan O'Brien — Last 10 Games — Pitching
Date	Tm	Opp	Dec	IP	H	R	ER	BB	SO	HR
1979-09-28	STL	NYN	—	3.0	5	2	2	0	1	0
1979-09-26	STL	PHI	—	3.1	5	3	3	3	0	0
1979-09-18	STL	PHI	L	1.0	3	2	2	0	1	0
1979-09-08	STL	WSN	—	1.0	1	0	0	0	1	0
1979-08-31	STL	SDP	W	2.0	3	0	0	0	2	0
1979-08-11	STL	CHC	—	0.2	4	3	3	0	0	0
1978-10-01	STL	WSN	L	0.1	2	4	1	2	0	0
1978-09-29	STL	WSN	—	2.0	1	0	0	0	2	0
1978-09-26	STL	NYN	—	1.0	0	0	0	0	2	0
1978-09-20	STL	NYN	—	5.0	6	3	3	3	4	1

Fielding Statistics

Career Fielding Totals by Position

Dan O'Brien — Career Fielding Totals by Position
Position	G	GS	PO	A	E	DP
P	13	2	0	2	0	0

Season-by-Season Fielding

Dan O'Brien — Season-by-Season Fielding
Year	Team	Pos	G	GS	PO	A	E	DP
1978	SLN	P	7	2	0	2	0	0
1979	SLN	P	6	0	0	0	0	0

Career Games by Position

Position Diamond

Circle size = games played at each position.

Dan O'Brien — Career Games by Position
Position	Games
Pitcher	13

College History

Dan O'Brien — College History
School Name	City	State	Years Attended
Florida State University	Tallahassee	FL	1973, 1974, 1975

Dan O'Brien: the record in brief

Between the debut on September 4, 1978 and the final game on September 28, 1979, Dan O'Brien built the record summarized on this page. O'Brien spent the whole of the career shown here with one club, the St. Louis Cardinals. At 6-foot-4 and 215 pounds, O'Brien is listed as a pitcher. The bio says O'Brien both batted and threw right-handed. O'Brien was born on April 22, 1954, in St. Petersburg, FL, USA. O'Brien's full given name, per the bio, is Daniel Joques O'Brien.

O'Brien pitched in 13 games, starting 2, and finished with a 1-3 record and 5.90 ERA. The same table counts 17 strikeouts. The league ERA over O'Brien's seasons was 3.84, so the 5.90 figure ran 53.4% worse than average. Among the heaviest workloads, the lowest ERA was 4.50 in 1978, when the league's was 3.69. By Pitcher PIV, Baseball Data Hub's measure of run prevention relative to each season's league, O'Brien's career adds up to 396.1.

Frequently Asked Questions about Dan O'Brien

What years did Dan O'Brien play?: Dan O'Brien played in Major League Baseball from 1978 to 1979.
Was Dan O'Brien a pitcher?: Yes. Dan O'Brien pitched in the major leagues, recording 1 wins and 17 strikeouts.
How many home runs did Dan O'Brien hit?: Dan O'Brien hit 0 career home runs.
What was Dan O'Brien's career batting average?: Dan O'Brien batted .000 over his career, with 0 hits in 5 at bats.
What was Dan O'Brien's career ERA?: Dan O'Brien finished with a 5.90 career ERA, going 1-3 with 17 strikeouts.
How many strikeouts did Dan O'Brien have?: Dan O'Brien recorded 17 career strikeouts.