What years did Ron Mrozinski play?

Ron Mrozinski played in Major League Baseball from 1954 to 1955.

Was Ron Mrozinski a pitcher?

Yes. Ron Mrozinski pitched in the major leagues, recording 1 wins and 44 strikeouts.

How many home runs did Ron Mrozinski hit?

Ron Mrozinski hit 0 career home runs with 1 hits.

What was Ron Mrozinski's career batting average?

Ron Mrozinski batted .062 over his career, with 1 hits in 16 at bats.

What was Ron Mrozinski's career ERA?

Ron Mrozinski finished with a 5.36 career ERA, going 1-3 with 44 strikeouts.

How many strikeouts did Ron Mrozinski have?

Ron Mrozinski recorded 44 career strikeouts.

Ron Mrozinski

Pitcher · Career Stats, Bio & Records (1954-1955)

Ron Mrozinski was a pitcher who played in Major League Baseball from 1954 to 1955 for the Philadelphia Phillies, a span of 2 seasons. Across 37 career appearances, he went 1-3 with a 5.36 ERA and 44 strikeouts.

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 5.36

WHIP 1.59

SO 44

Pitcher PIV -2101.5

Position: Pitcher
Bats / Throws: R / L
Height / Weight: 5'11" / 160 lb
Born: 9/16/1930 in White Haven, PA, USA
Died: 10/19/2005 in Washington, NJ, USA
MLB Debut: 1954-06-20
Last Game: 1955-09-09

Full name: Ronald Frank Mrozinski

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Career Pitching Statistics

Ron Mrozinski — Career Pitching Statistics
W	L	G	GS	CG	SHO	SV	IP	H	ER	HR	BB	SO	ERA	Pitcher PIV
1	3	37	5	1	0	1	82.1	87	49	12	44	44	5.36	-2101.5

Career ERA 5.36 vs. league average 3.95 across their career seasons — 35.7% worse than league average.

Season-by-Season Pitching

Pitching Career Arc

Click a stat to plot it across every season.

Ron Mrozinski — Season-by-Season Pitching
Year	Team	Lg	W	L	G	GS	CG	SV	IP	H	ER	BB	SO	ERA	Lg ERA	Pitcher PIV
1954	PHI	NL	1	1	15	4	1	0	48.0	49	24	25	26	4.50	3.90 (-15%)	-2025.9
1955	PHI	NL	0	2	22	1	0	1	34.1	38	25	19	18	6.55	4.00 (-64%)	-75.6
Career · 2 seasons			1	3	37	5	1	1	82.1	87	49	44	44	5.36	—	-2,101

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

Ron Mrozinski — Career Batting Statistics
G	AB	R	H	2B	3B	HR	RBI	SB	BB	SO	AVG	OBP	SLG	OPS	PIV
37	16	0	1	0	0	0	0	0	0	10	.062	.062	.062	.125	0

Career AVG .062 vs. league average .260 across their career seasons — 75.9% below league average.

Career OBP .062 vs. league average .333 across their career seasons — 81.2% below league average.

Career SLG .062 vs. league average .392 across their career seasons — 84.1% below league average.

Career OPS .125 vs. league average .725 across their career seasons — 82.8% below league average.

Season-by-Season Batting

Career Arc

Click a stat to plot it across every season.

Ron Mrozinski — Season-by-Season Batting
Year	Team	Lg	G	AB	H	SO	AVG	Lg AVG	Lg OBP	Lg SLG	Lg OPS	PIV
1954	PHI	NL	15	12	1	7	.083	—	—	—	—	0.0
1955	PHI	NL	22	4	0	3	.000	—	—	—	—	0.0
Career · 2 seasons			37	16	1	10	.062	—	—	—	—	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 (74 games) →

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

Batting — Home / Away

Ron Mrozinski — Batting — Home / Away
Split	G	AB	R	H	HR	RBI	AVG
Home	19	7	0	1	0	0	.143
Away	18	9	0	0	0	0	.000

Pitching — Home / Away

Ron Mrozinski — Pitching — Home / Away
Split	G	IP	H	ER	BB	SO	ERA
Home	19	45.2	42	26	22	23	5.12
Away	18	36.2	45	23	23	21	5.65

Last 10 Games — Batting

Ron Mrozinski — Last 10 Games — Batting
Date	Tm	Opp	Res	AB	SO
1955-09-09	PHI	STL	L	2	2
1955-09-05	PHI	BRO	L	0	0
1955-09-04	PHI	NY1	L	0	0
1955-08-26	PHI	STL	L	0	0
1955-08-02	PHI	CIN	L	0	0
1955-07-22	PHI	STL	L	0	0
1955-07-17	PHI	CHC	W	0	0
1955-07-14	PHI	ATL	L	0	0
1955-07-04	PHI	BRO	L	0	0
1955-07-03	PHI	NY1	L	0	0

Last 10 Games — Pitching

Ron Mrozinski — Last 10 Games — Pitching
Date	Tm	Opp	Dec	IP	H	R	ER	BB	SO	HR
1955-09-09	PHI	STL	—	2.2	4	3	3	2	1	0
1955-09-05	PHI	BRO	—	0.2	2	1	1	0	0	1
1955-09-04	PHI	NY1	—	1.1	1	0	0	1	1	0
1955-08-26	PHI	STL	—	3.0	2	0	0	1	1	0
1955-08-02	PHI	CIN	—	1.0	1	0	0	0	0	0
1955-07-22	PHI	STL	—	1.1	1	1	1	1	0	0
1955-07-17	PHI	CHC	—	1.0	0	0	0	1	1	0
1955-07-14	PHI	ATL	—	2.0	2	2	1	4	1	0
1955-07-04	PHI	BRO	—	1.0	1	0	0	0	1	0
1955-07-03	PHI	NY1	—	0.1	0	0	0	0	0	0

Fielding Statistics

Career Fielding Totals by Position

Ron Mrozinski — Career Fielding Totals by Position
Position	G	GS	PO	A	E	DP
P	37	5	3	8	1	3

Season-by-Season Fielding

Ron Mrozinski — Season-by-Season Fielding
Year	Team	Pos	G	GS	PO	A	E	DP
1954	PHI	P	15	4	3	3	0	1
1955	PHI	P	22	1	0	5	1	2

Career Games by Position

Position Diamond

Circle size = games played at each position.

Ron Mrozinski — Career Games by Position
Position	Games
Pitcher	37

Ron Mrozinski: the record in brief

Between the debut on June 20, 1954 and the final game on September 9, 1955, Ron Mrozinski built the record summarized on this page. Mrozinski spent the whole of the career shown here with one club, the Philadelphia Phillies. Mrozinski played primarily as a pitcher and threw left-handed and batted right-handed. The bio adds a birth date on September 16, 1930, in White Haven, PA, USA and a listed size of 160 pounds on a 5-foot-11 frame. Mrozinski died on October 19, 2005, in Washington, NJ, USA. The given name on file is Ronald Frank Mrozinski.

Mrozinski went 1-3 with a 5.36 ERA in 37 games, 5 of them starts. The totals include 44 strikeouts. Against a 3.95 league ERA for the same seasons, the 5.36 mark was 35.7% worse. Among the heaviest workloads, the lowest ERA was 4.50 in 1954, when the league's was 3.90.

The position breakdown shows 37 games, all at pitcher. Fielding on the mound produced 3 putouts and 8 assists against 1 errors.

Frequently Asked Questions about Ron Mrozinski

What years did Ron Mrozinski play?: Ron Mrozinski played in Major League Baseball from 1954 to 1955.
Was Ron Mrozinski a pitcher?: Yes. Ron Mrozinski pitched in the major leagues, recording 1 wins and 44 strikeouts.
How many home runs did Ron Mrozinski hit?: Ron Mrozinski hit 0 career home runs with 1 hits.
What was Ron Mrozinski's career batting average?: Ron Mrozinski batted .062 over his career, with 1 hits in 16 at bats.
What was Ron Mrozinski's career ERA?: Ron Mrozinski finished with a 5.36 career ERA, going 1-3 with 44 strikeouts.
How many strikeouts did Ron Mrozinski have?: Ron Mrozinski recorded 44 career strikeouts.