What years did Ronald Bolanos play?

Ronald Bolanos played in Major League Baseball from 2019 to 2022.

Was Ronald Bolanos a pitcher?

Yes. Ronald Bolanos pitched in the major leagues, recording 0 wins and 43 strikeouts.

How many home runs did Ronald Bolanos hit?

Ronald Bolanos hit 0 career home runs.

What was Ronald Bolanos's career batting average?

Ronald Bolanos batted .000 over his career, with 0 hits in 5 at bats.

How many RBI did Ronald Bolanos have?

Ronald Bolanos drove in 1 runs in his career.

What was Ronald Bolanos's career ERA?

Ronald Bolanos finished with a 5.25 career ERA, going 0-4 with 43 strikeouts.

Ronald Bolanos

Pitcher · Career Stats, Bio & Records (2019-2022)

Ronald Bolanos was a pitcher who played in Major League Baseball from 2019 to 2022 for the San Diego Padres and the Kansas City Royals, a span of 4 seasons. Across 18 career appearances, he went 0-4 with a 5.25 ERA and 43 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 September 8, 2026

W–L 0–4

ERA 5.25

WHIP 1.62

SO 43

Pitcher PIV -1148.0

Position: Pitcher
Bats / Throws: R / R
Height / Weight: 6'2" / 230 lb
Born: 8/23/1996 in Santa Cruz del Norte, Mayabeque, Cuba
MLB Debut: 2019-09-03
Last Game: 2022-06-03

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Career Pitching Statistics

Ronald Bolanos — Career Pitching Statistics
W	L	G	GS	CG	SHO	SV	IP	H	ER	HR	BB	SO	ERA	Pitcher PIV
0	4	18	5	0	0	0	48.0	49	28	7	29	43	5.25	-1148.0

Career ERA 5.25 vs. league average 4.27 across their career seasons — 23.0% worse than league average.

Season-by-Season Pitching

Pitching Career Arc

Click a stat to plot it across every season.

Ronald Bolanos — Season-by-Season Pitching
Year	Team	Lg	L	G	GS	IP	H	ER	BB	SO	ERA	Lg ERA	Pitcher PIV
2019	SDN	NL	2	5	3	19.7	17	13	12	19	5.95	4.51 (-32%)	-365.3
2020	KCA	AL	2	2	2	3.7	8	5	3	2	12.27	—	0.0
2021	KCA	AL	0	3	0	6.3	4	1	2	10	1.42	—	0.0
2022	KCA	AL	0	8	0	18.3	20	9	12	12	4.42	3.97 (-11%)	-782.7
Career · 4 seasons			4	18	5	48.0	49	28	29	43	5.25	—	-1,148

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

Ronald Bolanos — Career Batting Statistics
G	AB	R	H	2B	3B	HR	RBI	SB	BB	SO	AVG	OBP	SLG	OPS	PIV
18	5	1	0	0	0	0	1	0	0	4	.000	.000	.000	.000	0

Career AVG .000 vs. league average .246 across their career seasons — 100.0% below league average.

Career OBP .000 vs. league average .318 across their career seasons — 100.0% below league average.

Career SLG .000 vs. league average .414 across their career seasons — 100.0% below league average.

Career OPS .000 vs. league average .732 across their career seasons — 100.0% below league average.

Season-by-Season Batting

Career Arc

Click a stat to plot it across every season.

Ronald Bolanos — Season-by-Season Batting
Year	Team	Lg	G	AB	R	RBI	SO	AVG	Lg AVG	Lg OBP	Lg SLG	Lg OPS	PIV
2019	SDN	NL	5	5	1	1	4	.000	—	—	—	—	0.0
2020	KCA	AL	2	0	0	0	0	.000	—	—	—	—	0.0
2021	KCA	AL	3	0	0	0	0	.000	—	—	—	—	0.0
2022	KCA	AL	8	0	0	0	0	.000	—	—	—	—	0.0
Career · 4 seasons			18	5	1	1	4	.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 (36 games) →

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

Batting — Home / Away

Ronald Bolanos — Batting — Home / Away
Split	G	AB	R	H	HR	RBI	AVG
Home	8	3	1	0	0	1	.000
Away	10	2	0	0	0	0	.000

Pitching — Home / Away

Ronald Bolanos — Pitching — Home / Away
Split	G	IP	H	ER	BB	SO	ERA
Home	8	20.1	27	21	19	16	9.30
Away	10	27.2	22	7	10	27	2.28

Last 10 Games — Pitching

Ronald Bolanos — Last 10 Games — Pitching
Date	Tm	Opp	Dec	IP	H	R	ER	BB	SO	HR
2022-06-03	KCR	HOU	—	0.1	3	3	3	2	1	0
2022-05-29	KCR	MIN	—	2.0	2	1	1	0	0	0
2022-05-19	KCR	CHW	—	3.0	3	1	1	0	2	0
2022-05-14	KCR	COL	—	4.0	2	1	1	2	4	1
2022-05-09	KCR	BAL	—	2.0	2	0	0	1	1	0
2022-05-04	KCR	STL	—	2.2	4	3	3	3	1	1
2022-04-30	KCR	NYY	—	3.0	2	0	0	3	1	0
2022-04-23	KCR	SEA	—	1.1	2	0	0	1	2	0
2021-06-12	KCR	OAK	—	3.1	2	1	1	2	4	0
2021-06-08	KCR	LAA	—	2.0	0	0	0	0	5	0

Fielding Statistics

Career Fielding Totals by Position

Ronald Bolanos — Career Fielding Totals by Position
Position	G	GS	PO	A	E	DP
P	18	5	4	3	0	0

Season-by-Season Fielding

Ronald Bolanos — Season-by-Season Fielding
Year	Team	Pos	G	GS	PO	A
2019	SDN	P	5	3	2	0
2020	KCA	P	2	2	0	0
2021	KCA	P	3	0	0	0
2022	KCA	P	8	0	2	3

Career Games by Position

Position Diamond

Circle size = games played at each position.

Ronald Bolanos — Career Games by Position
Position	Games
Pitcher	18

Frequently Asked Questions about Ronald Bolanos

What years did Ronald Bolanos play?: Ronald Bolanos played in Major League Baseball from 2019 to 2022.
Was Ronald Bolanos a pitcher?: Yes. Ronald Bolanos pitched in the major leagues, recording 0 wins and 43 strikeouts.
How many home runs did Ronald Bolanos hit?: Ronald Bolanos hit 0 career home runs.
What was Ronald Bolanos's career batting average?: Ronald Bolanos batted .000 over his career, with 0 hits in 5 at bats.
How many RBI did Ronald Bolanos have?: Ronald Bolanos drove in 1 runs in his career.
What was Ronald Bolanos's career ERA?: Ronald Bolanos finished with a 5.25 career ERA, going 0-4 with 43 strikeouts.