Kenley Jansen

Active

Detroit Tigers · Pitcher

Age 386' 5" · 265 lbsThrows Right

FBaseball Overview

At 38 years old, Jansen enters his second season with Detroit as a proven late-inning weapon whose 2025 campaign demonstrated he still possesses the stuff to dominate out of the bullpen—he posted a 2.59 ERA with 29 saves and 0.95 WHIP across 59 innings. However, his early 2026 numbers raise immediate concerns, as a 5.31 ERA and 1.23 WHIP through 20 innings suggest either regression or early-season adjustment issues that fantasy managers must monitor closely. The veteran closer remains a potential source of saves if he regains his 2025 form, but his age and inconsistent start make him a risk-reward selection best suited for deep league formats or as a late-round flier. Target him only if you're comfortable with volatility and willing to pivot quickly if the struggles persist.

MLB Pitching

Year	Team	G	W	L	SV	ERA	WHIP	K	IP	BB
2010	Los Angeles Dodgers	25	1	0	4	0.67	1.00	41	27.0	15
2011	Los Angeles Dodgers	51	2	1	5	2.85	1.04	96	53.2	26
2012	Los Angeles Dodgers	65	5	3	25	2.35	0.85	99	65.0	22
2013	Los Angeles Dodgers	75	4	3	28	1.88	0.86	111	76.2	18
2014	Los Angeles Dodgers	68	2	3	44	2.76	1.13	101	65.1	19
2015	Los Angeles Dodgers	54	2	1	36	2.41	0.78	80	52.1	8
2016	Los Angeles Dodgers	71	3	2	47	1.83	0.67	104	68.2	11
2017	Los Angeles Dodgers	65	5	0	41	1.32	0.75	109	68.1	7
2018	Los Angeles Dodgers	69	1	5	38	3.01	0.99	82	71.2	17
2019	Los Angeles Dodgers	62	5	3	33	3.71	1.06	80	63.0	16
2020	Los Angeles Dodgers	27	3	1	11	3.33	1.15	33	24.1	9
2021	Los Angeles Dodgers	69	4	4	38	2.22	1.04	86	69.0	36
2022	Atlanta Braves	65	5	2	41	3.38	1.05	85	64.0	22
2023	Boston Red Sox	51	3	6	29	3.63	1.28	52	44.2	17
2024	Boston Red Sox	54	4	2	27	3.29	1.06	62	54.2	20
2025	Los Angeles Angels	62	5	4	29	2.59	0.95	57	59.0	19
2026	Detroit Tigers	25	1	4	10	4.98	1.20	23	21.2	12
Career	Totals	958	55	44	486	2.63	0.97	1301	948.3	294

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
2009	Inland Empire 66ers	12	0	0	0	0	4.63	2.14	19	11.2	11
2010	2 teams▼	33	0	5	1	8	1.60	1.16	78	45	23
2011	2 teams▼	7	2	0	1	0	3.38	0.63	13	8	3
2015	Rancho Cucamonga Quakes	6	5	0	1	0	5.06	1.31	8	5.1	1
2026	Toledo Mud Hens	1	0	0	0	0	40.50	4.50	1	0.2	1
Career	Totals	59	7	5	3	8	2.93	1.30	119	70.2	39

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

Game Log2026 season

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Pitching Analytics2026 season · via Baseball Savant

Click for year to year changes

FB Velo93.7 mph

Avg Spin2618 rpm

Whiff %26.2%

K %25.6%

BB %13.3%

Hard Hit %29.1%

Barrel %7.3%

xERA3.67

xBA Against0.206

xSLG Against0.354

BA Against0.182

SLG Against0.377

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.

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Year

Team

ERA

WHIP

2010

Los Angeles Dodgers

0.67

1.00

27.0

2011

Los Angeles Dodgers

2.85

1.04

53.2

2012

Los Angeles Dodgers

2.35

0.85

65.0

2013

Los Angeles Dodgers

1.88

0.86

111

76.2

2014

Los Angeles Dodgers

2.76

1.13

101

65.1

2015

Los Angeles Dodgers

2.41

0.78

52.1

2016

Los Angeles Dodgers

1.83

0.67

104

68.2

2017

Los Angeles Dodgers

1.32

0.75

109

68.1

2018

Los Angeles Dodgers

3.01

0.99

71.2

2019

Los Angeles Dodgers

3.71

1.06

63.0

2020

Los Angeles Dodgers

3.33

1.15

24.1

2021

Los Angeles Dodgers

2.22

1.04

69.0

2022

Atlanta Braves

3.38

1.05

64.0

2023

Boston Red Sox

3.63

1.28

44.2

2024

Boston Red Sox

3.29

1.06

54.2

2025

Los Angeles Angels

2.59

0.95

59.0

2026

Detroit Tigers

4.98

1.20

21.2

Career

Totals

958

486

2.63

0.97

1301

948.3

294

Year

Team

ERA

WHIP

2009

Inland Empire 66ers

4.63

2.14

11.2

2010

2 teams▼

1.60

1.16

2011

2 teams▼

3.38

0.63

2015

Rancho Cucamonga Quakes

5.06

1.31

5.1

2026

Toledo Mud Hens

40.50

4.50

0.2

Career

Totals

2.93

1.30

119

70.2