Michael Petersen

Active

Miami Marlins · Pitcher

Age 326' 7" · 195 lbsThrows Right

FBaseball Overview

The 32-year-old right-hander offers modest value as a depth pitcher in Miami's rotation, having made the jump to full-time MLB action in 2024 and improving his ratios through 2026 with a 3.22 ERA and 1.02 WHIP across 36 innings. Petersen provides streaky production in ERA and WHIP categories with solid strikeout velocity—44 K's through early 2026 suggests he can contribute to strikeout totals in deeper leagues, though win totals remain limited by his low-win role in a rebuilding Marlins organization. The primary risk is volatility in ERA given his limited innings and relatively short track record at the majors, while the upside hinges on whether he earns more consistent opportunities as a starter rather than bouncing between the rotation and bullpen. Fantasy managers should view him as a waiver-wire target for streaming rather than a season-long cornerstone piece.

MLB Pitching

Year	Team	G	W	L	SV	ERA	WHIP	K	IP	BB
2024	2 teams▼	16	3	1	0	5.95	1.63	14	19.2	11
2025	2 teams▼	15	0	0	0	4.00	1.39	17	18.0	7
2026	Miami Marlins	36	1	1	1	3.08	1.03	46	38.0	15
Career	Totals	67	4	2	1	4.04	1.27	77	75.2	33

Source: MLB Stats API · Multi-team seasons show combined totals — click to expand

Minor League Pitching

Year	Team	G	GS	W	L	SV	ERA	WHIP	K	IP	BB
2015	AZL Brewers	4	3	1	0	0	1.35	0.75	5	6.2	2
2016	Helena Brewers	10	5	1	3	0	7.71	2.31	19	23.1	13
2017	Helena Brewers	15	9	1	3	0	6.41	1.77	48	46.1	31
2018	Wisconsin Timber Rattlers	32	0	2	1	4	3.46	1.27	62	67.2	25
2019	Carolina Mudcats	41	0	1	2	2	3.00	1.28	65	54.0	34
2022	ACL Rockies	1	1	0	0	0	0.00	0.00	2	1.0	0
2023	2 teams▼	41	0	2	2	2	3.46	1.51	49	41.2	25
2024	Oklahoma City Baseball Club	35	0	2	0	10	1.64	0.76	44	33.0	8
2025	3 teams▼	33	1	0	1	1	4.46	1.43	47	36.1	12
Career	Totals	212	19	10	12	19	4.01	1.41	341	309.3	150

Source: MLB Stats API · Multi-team seasons show combined totals — click to expand

Game Log2026 season

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Analytics2026 season · via Baseball Savant

Click for year to year changes

FB Velo97.6 mph

Avg Spin2212 rpm

Whiff %29.7%

K %30.3%

BB %9.9%

Hard Hit %47.2%

Barrel %12.4%

xERA3.54

xBA Against0.195

xSLG Against0.385

BA Against0.178

SLG Against0.311

What These Stats Mean

FB Velo — Average fastball velocity. Harder throwers generate more swings and misses, setting up every other pitch in their arsenal. Velocity is the foundation of strikeout upside.

Avg Spin — Average spin rate across all pitches. Higher spin creates more movement and makes pitches harder to square up — elite spinners run better strikeout and batting average against numbers.

Whiff % — Swings-and-misses per swing. The most direct measure of a pitcher's ability to miss bats and the best leading indicator of strikeout rate.

K % — Strikeout rate per batter faced. The core fantasy pitching stat — high K% means reliable strikeout totals that hold up even in shorter starts.

BB % — Walk rate per batter faced. The primary control metric. High BB% tanks ERA and WHIP and keeps baserunners on constantly. Elite starters typically run below 7%.

Hard Hit % — Percentage of batted balls hit 95 mph or harder against. Low hard-hit% means weak contact, protecting both ERA and the defense behind the pitcher.

Barrel % — Percentage of batted balls barreled against. The most direct home run predictor — low barrel% pitchers rarely give up long balls.

xERA — Expected ERA based on contact quality allowed, removing the effect of sequencing, luck, and defense. Better predictor of future ERA than ERA itself.

xBA Against — Expected batting average opponents should hit based on contact quality. A gap between xBA and actual BA indicates unsustainable luck in either direction.

xSLG Against — Expected slugging allowed based on contact quality. High xSLG against predicts future extra-base damage; low xSLG means the pitcher is genuinely suppressing power.

BA Against — Actual batting average opponents are hitting — a key WHIP component. Check xBA to see if the number is sustainable.

SLG Against — Actual slugging allowed. Captures hits, doubles, triples, and home runs — lower means the pitcher is limiting the power damage he gives up.

GB% — Ground ball rate. High GB% pitchers generate double plays, limit home runs, and keep the ball in the park — great for protecting ERA and WHIP ratios.

FB% — Fly ball rate. High FB% pitchers give up more air contact — dangerous when combined with high exit velocity, less so when contact is soft.

Loading player data...

Year

Team

ERA

WHIP

2024

2 teams▼

5.95

1.63

19.2

2025

2 teams▼

4.00

1.39

18.0

2026

Miami Marlins

3.08

1.03

38.0

Career

Totals

4.04

1.27

75.2

Year

Team

ERA

WHIP

2015

AZL Brewers

1.35

0.75

6.2

2016

Helena Brewers

7.71

2.31

23.1

2017

Helena Brewers

6.41

1.77

46.1

2018

Wisconsin Timber Rattlers

3.46

1.27

67.2

2019

Carolina Mudcats

3.00

1.28

54.0

2022

ACL Rockies

0.00

1.0

2023

2 teams▼

3.46

1.51

41.2

2024

Oklahoma City Baseball Club

1.64

0.76

33.0

2025

3 teams▼

4.46

1.43

36.1

Career

Totals

212

4.01

1.41

341

309.3

150