Yilber Díaz

Active

Toledo Mud Hens · Pitcher

Age 266' 0" · 190 lbsThrows Right

FBaseball Overview

This 25-year-old right-hander remains a prospect in transition after his 2024 Triple-A All-Star selection, though his early MLB showings have been sobering with a 9.00 ERA and 2.33 WHIP across limited 2025 action. Díaz offers long-term strikeout potential if he can establish himself in the majors, but he currently lacks a defined role and reliable innings, making him a stash candidate rather than a draft priority for 2026. His minuscule pitch counts and ERA struggles suggest he'll need to reclaim form in Triple-A before becoming a consistent contributor in wins, strikeouts, or saves categories. Fantasy managers should monitor his development closely, as a successful callup could unlock significant value, but he's not a plug-and-play option at this stage of his career.

MLB Pitching

Year	Team	G	GS	W	L	ERA	WHIP	K	IP	BB
2024	Arizona Diamondbacks	7	4	1	1	3.81	1.38	19	28.1	12
2025	Arizona Diamondbacks	1	0	0	0	9.00	2.33	1	3.0	3
2026	2 teams▼	5	0	0	0	16.50	2.83	6	6.0	5
Career	Totals	13	4	1	1	6.27	1.69	26	37.1	20

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
2021	DSL D-backs 1	19	1	2	3	0	5.13	1.59	17	26.1	18
2022	2 teams▼	19	17	4	3	1	4.06	1.21	99	77.2	38
2023	2 teams▼	25	25	3	10	0	4.82	1.34	140	102.2	58
2024	2 teams▼	21	19	6	9	0	3.80	1.27	140	104.1	47
2025	3 teams▼	35	8	1	3	0	10.26	2.28	70	57	73
2026	2 teams▼	42	0	4	5	4	3.71	1.59	64	51.0	35
Career	Totals	161	70	20	33	5	5.05	1.47	530	419	269

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

Last Week / Last Month

Current season · MLB only

7 games

G	GS	IP	W-L	SV	ERA	WHIP	K	BB
5	0	6.0	0-0	0	16.50	2.83	6	5

30 games

G	GS	IP	W-L	SV	ERA	WHIP	K	BB
5	0	6.0	0-0	0	16.50	2.83	6	5

Game Log2026 MLB

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Advanced Stats2026 season · via Baseball Savant

Click for year to year changes

FB Velo97.0 mph

Avg Spin2439 rpm

Whiff %22.2%

K %17.6%

BB %14.7%

Hard Hit %43.5%

Barrel %13.0%

xERA11.58

xBA Against0.362

xSLG Against0.666

BA Against0.414

SLG Against0.793

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

Arizona Diamondbacks

3.81

1.38

28.1

2025

Arizona Diamondbacks

9.00

2.33

3.0

2026

2 teams▼

16.50

2.83

6.0

Career

Totals

6.27

1.69

37.1

Year

Team

ERA

WHIP

2021

DSL D-backs 1

5.13

1.59

26.1

2022

2 teams▼

4.06

1.21

77.2

2023

2 teams▼

4.82

1.34

140

102.2

2024

2 teams▼

3.80

1.27

140

104.1

2025

3 teams▼

10.26

2.28

2026

2 teams▼

3.71

1.59

51.0

Career

Totals

161

5.05

1.47

530

419

269

W-L

ERA

WHIP

6.0

0-0

16.50

2.83

W-L

ERA

WHIP

6.0

0-0

16.50

2.83