Mark Leiter Jr.

ActiveIL

Athletics · Pitcher

Age 356' 0" · 210 lbsThrows Right

FBaseball Overview

At 35 years old, Leiter Jr. operates primarily in a relief capacity for Oakland, as evidenced by his four saves through early 2026 and limited innings pitched. His strikeout rate remains respectable with 31 K in 29.2 IP this season, offering modest upside in that category, though his ERA and WHIP have remained elevated and consistent with his 2025 performance. The veteran right-hander presents a floor play for saves in deeper leagues where he holds the closer role, but the 4.85 ERA and 1.38 WHIP limit his overall fantasy ceiling compared to more dominant relievers. His age and recent track record suggest he functions best as a backend relief option rather than a cornerstone fantasy asset, making him a targeted late-round flier for managers seeking saves with acceptable strikeout production.

MLB Pitching

Year	Team	G	GS	W	L	SV	ERA	WHIP	K	IP	BB
2017	Philadelphia Phillies	27	11	3	6	0	4.96	1.33	84	90.2	31
2018	2 teams▼	20	0	0	1	0	7.71	2.01	22	23.1	12
2022	Chicago Cubs	35	4	2	7	3	3.99	1.14	73	67.2	25
2023	Chicago Cubs	69	0	1	3	4	3.50	1.12	77	64.1	24
2024	2 teams▼	60	0	4	5	0	4.50	1.33	86	58.0	22
2025	New York Yankees	59	0	6	7	2	4.84	1.53	54	48.1	17
2026	Athletics	36	0	0	1	4	4.28	1.31	38	33.2	11
Career	Totals	306	15	16	30	13	4.57	1.33	434	386	142

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
2013	3 teams▼	16	4	4	0	0	1.20	1.04	50	45	13
2014	2 teams▼	27	27	9	12	0	4.35	1.32	141	149	37
2015	2 teams▼	27	21	8	7	1	3.09	1.18	121	142.2	34
2016	Reading Fightin Phils	23	17	6	3	1	3.39	1.17	94	103.2	30
2017	Lehigh Valley IronPigs	7	5	2	1	0	4.20	1.10	38	30.0	6
2018	2 teams▼	23	0	3	1	0	3.24	1.29	39	33.1	14
2021	2 teams▼	25	19	10	8	0	3.77	1.07	145	114.2	31
2022	Iowa Cubs	6	6	0	3	0	5.32	1.23	32	22.0	6
2025	Somerset Patriots	1	0	0	0	0	0.00	1.00	0	1.0	1
Career	Totals	155	99	42	35	2	3.55	1.19	660	641.1	172

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 Velo92.2 mph

Avg Spin1661 rpm

Whiff %30.3%

K %26.4%

BB %7.6%

Hard Hit %31.9%

Barrel %3.3%

xERA4.20

xBA Against0.269

xSLG Against0.365

BA Against0.258

SLG Against0.344

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

2017

Philadelphia Phillies

4.96

1.33

90.2

2018

2 teams▼

7.71

2.01

23.1

2022

Chicago Cubs

3.99

1.14

67.2

2023

Chicago Cubs

3.50

1.12

64.1

2024

2 teams▼

4.50

1.33

58.0

2025

New York Yankees

4.84

1.53

48.1

2026

Athletics

4.28

1.31

33.2

Career

Totals

306

4.57

1.33

434

386

142

Year

Team

ERA

WHIP

2013

3 teams▼

1.20

1.04

2014

2 teams▼

4.35

1.32

141

149

2015

2 teams▼

3.09

1.18

121

142.2

2016

Reading Fightin Phils

3.39

1.17

103.2

2017

Lehigh Valley IronPigs

4.20

1.10

30.0

2018

2 teams▼

3.24

1.29

33.1

2021

2 teams▼

3.77

1.07

145

114.2

2022

Iowa Cubs

5.32

1.23

22.0

2025

Somerset Patriots

0.00

1.00

1.0

Career

Totals

155

3.55

1.19

660

641.1

172