Tyron Guerrero

ActiveIL

Boston Red Sox · Pitcher

Age 356' 8" · 225 lbsThrows Right

FBaseball Overview

At 35 years old, Guerrero enters 2026 as a depth arm in Boston's rotation with limited immediate fantasy appeal based on his early-season numbers. His 3.07 ERA and 1.02 WHIP through 14.2 innings suggest he's maintaining reasonable control, though the 0-1 record and lack of run support hint at potential frustration for win-dependent managers. With 21 strikeouts in a small sample, he's generating some whiffs, but age and workload concerns make him a speculative play at best—primarily valuable only in deep leagues or as a streamer when Boston faces favorable matchups. Fantasy managers should monitor his role stability and innings allocation, as a veteran pitcher this late in his career may be limited to sporadic starts rather than a permanent rotation slot.

MLB Pitching

Year	Team	G	W	L	ERA	WHIP	K	IP	BB
2016	San Diego Padres	1	0	0	4.50	2.00	0	2.0	1
2018	Miami Marlins	60	1	3	5.43	1.62	68	58.0	30
2019	Miami Marlins	52	1	2	6.26	1.70	43	46.0	36
2026	Boston Red Sox	38	1	2	3.26	1.14	36	38.2	7
Career	Totals	151	3	7	5.10	1.52	147	144.2	74

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
2010	DSL Padres	16	5	3	2	1	3.42	1.48	50	47.1	32
2011	AZL Padres	16	4	0	4	0	9.62	2.55	24	33.2	41
2012	2 teams▼	9	7	1	1	0	2.49	1.22	17	25.1	14
2013	3 teams▼	22	4	2	5	0	4.91	1.74	44	40.1	33
2014	2 teams▼	39	0	6	1	4	1.45	1.05	56	49.2	20
2015	2 teams▼	48	0	1	5	14	3.05	1.29	61	56	31
2016	3 teams▼	31	0	1	4	4	3.82	1.17	40	37.2	13
2017	2 teams▼	17	0	0	1	0	3.38	1.75	22	16.0	14
2018	Jacksonville Jumbo Shrimp	3	0	0	0	0	0.00	0.67	2	3.0	1
2019	2 teams▼	5	1	1	0	0	5.06	1.13	2	5.1	2
2021	Charlotte Knights	18	1	1	0	0	6.63	2.21	25	19.0	12
2023	Louisville Bats	20	0	0	4	0	11.51	2.25	20	22.2	22
2024	2 teams▼	33	1	3	3	1	5.70	1.73	38	36.1	11
2026	Worcester Red Sox	15	0	0	0	3	0.92	0.97	22	19.2	6
Career	Totals	305	23	22	32	27	4.56	1.54	430	428.1	262

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

Game Log2026 MLB

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Advanced Stats2026 season · via Baseball Savant

Click for year to year changes

FB Velo100.2 mph

Avg Spin2170 rpm

Whiff %23.3%

K %22.6%

BB %4.4%

Hard Hit %33.6%

Barrel %3.5%

xERA2.79

xBA Against0.227

xSLG Against0.319

BA Against0.248

SLG Against0.315

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

2016

San Diego Padres

4.50

2.00

2.0

2018

Miami Marlins

5.43

1.62

58.0

2019

Miami Marlins

6.26

1.70

46.0

2026

Boston Red Sox

3.26

1.14

38.2

Career

Totals

151

5.10

1.52

147

144.2

Year

Team

ERA

WHIP

2010

DSL Padres

3.42

1.48

47.1

2011

AZL Padres

9.62

2.55

33.2

2012

2 teams▼

2.49

1.22

25.1

2013

3 teams▼

4.91

1.74

40.1

2014

2 teams▼

1.45

1.05

49.2

2015

2 teams▼

3.05

1.29

2016

3 teams▼

3.82

1.17

37.2

2017

2 teams▼

3.38

1.75

16.0

2018

Jacksonville Jumbo Shrimp

0.00

0.67

3.0

2019

2 teams▼

5.06

1.13

5.1

2021

Charlotte Knights

6.63

2.21

19.0

2023

Louisville Bats

11.51

2.25

22.2

2024

2 teams▼

5.70

1.73

36.1

2026

Worcester Red Sox

0.92

0.97

19.2

Career

Totals

305

4.56

1.54

430

428.1

262