Blas Castaño

Active

Colorado Rockies · Pitcher

Age 275' 10" · 162 lbsThrows Right

FBaseball Overview

The 27-year-old right-hander shows modest early-season encouragement with a 3.92 ERA and 1.35 WHIP through 20 innings in 2026, suggesting he's finding stability after a rocky 2025 debut. His strikeout rate remains modest at around 7.4 K/9, which limits upside in that category, though he does hold a 1-0 record to start the season. Playing for the Rockies presents a significant headwind given Coors Field's pitcher-unfriendly environment, meaning his ERA and ratios could inflate with extended playing time. Fantasy managers should view Castaño as a deep-league flier with rotation potential rather than a weekly starter, banking on continued improvement while monitoring his ability to sustain strikeout production in a challenging home ballpark.

MLB Pitching

Year	Team	G	W	ERA	WHIP	K	IP	BB
2025	Seattle Mariners	1	0	9.00	2.00	1	3.0	2
2026	Colorado Rockies	11	2	4.15	1.43	18	21.2	6
Career	Totals	12	2	4.74	1.50	19	24.2	8

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
2018	DSL Yankees	11	7	1	5	0	5.40	1.60	30	40.0	20
2019	2 teams▼	14	10	2	5	0	4.05	1.41	41	66.2	14
2021	2 teams▼	10	8	6	2	0	4.17	1.28	55	45.1	10
2022	2 teams▼	22	21	5	9	0	3.86	1.30	103	107.1	34
2023	3 teams▼	24	11	5	6	0	4.58	1.39	72	74.2	35
2024	2 teams▼	29	26	5	8	0	4.38	1.37	108	125.1	43
2025	Tacoma Rainiers	29	24	8	6	0	5.19	1.39	97	126.2	51
2026	2 teams▼	23	0	6	1	1	2.76	1.13	23	29.1	14
Career	Totals	164	107	38	42	1	4.39	1.36	532	619	221

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 Velo94.2 mph

Avg Spin2240 rpm

Whiff %19.9%

K %19.8%

BB %6.6%

Hard Hit %50.0%

Barrel %9.4%

xERA6.15

xBA Against0.303

xSLG Against0.505

BA Against0.305

SLG Against0.524

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

2025

Seattle Mariners

9.00

2.00

3.0

2026

Colorado Rockies

4.15

1.43

21.2

Career

Totals

4.74

1.50

24.2

Year

Team

ERA

WHIP

2018

DSL Yankees

5.40

1.60

40.0

2019

2 teams▼

4.05

1.41

66.2

2021

2 teams▼

4.17

1.28

45.1

2022

2 teams▼

3.86

1.30

103

107.1

2023

3 teams▼

4.58

1.39

74.2

2024

2 teams▼

4.38

1.37

108

125.1

2025

Tacoma Rainiers

5.19

1.39

126.2

2026

2 teams▼

2.76

1.13

29.1

Career

Totals

164

107

4.39

1.36

532

619

221