Mason Barnett

Active

Athletics · RP/SP

Age 256' 0" · 218 lbsThrows Right

#586 Preseason

FBaseball Overview

After a rough 2025 debut, Barnett shows encouraging early returns in 2026 with a sharp 1.17 ERA and 0.98 WHIP through his first 15.1 innings, suggesting the 25-year-old may finally be settling into his role. His strikeout rate remains solid with 19 K through limited action, though his resume lacks the dominant track record needed to inspire full confidence just yet. The Athletics appear to be testing him in a multi-inning relief capacity given his two early saves, which could provide some counting stat value if he earns more closure opportunities. Fantasy managers should view Barnett as a speculative depth pickup who could offer ERA and WHIP help if he maintains this improved command, but his brief, turbulent MLB history means he warrants cautious optimism rather than aggressive investment.

MLB Pitching

Year	Team	G	GS	W	L	SV	ERA	WHIP	K	IP	BB
2025	Athletics	5	5	1	1	0	6.85	1.66	18	22.1	11
2026	Athletics	20	6	1	4	2	7.02	1.66	50	50.0	30
Career	Totals	25	11	2	5	2	6.97	1.66	68	72.1	41

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

Minor League Pitching

Year	Team	G	GS	W	L	ERA	WHIP	K	IP	BB
2022	2 teams▼	4	1	1	0	0.00	0.13	12	8	1
2023	2 teams▼	23	23	6	7	3.30	1.19	137	114.2	50
2024	2 teams▼	26	25	9	8	4.20	1.28	161	133.0	49
2025	Las Vegas Aviators	25	23	6	2	6.13	1.60	124	119.0	65
2026	Las Vegas Aviators	14	14	4	3	5.16	1.57	50	66.1	36
Career	Totals	92	86	26	20	4.55	1.36	484	440.3	201

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
7	6	28.2	0-4	0	8.79	1.88	29	18

30 games

G	GS	IP	W-L	SV	ERA	WHIP	K	BB
20	6	50.0	1-4	2	7.02	1.66	50	30

Game Log2026 MLB

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Advanced Stats2026 season · via Baseball Savant

Click for year to year changes

FB Velo94.9 mph

Avg Spin2301 rpm

Whiff %22.3%

K %21.8%

BB %13.1%

Hard Hit %40.1%

Barrel %8.8%

xERA5.09

xBA Against0.246

xSLG Against0.431

BA Against0.270

SLG Against0.526

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

Athletics

6.85

1.66

22.1

2026

Athletics

7.02

1.66

50.0

Career

Totals

6.97

1.66

72.1

Year

Team

ERA

WHIP

2022

2 teams▼

0.00

0.13

2023

2 teams▼

3.30

1.19

137

114.2

2024

2 teams▼

4.20

1.28

161

133.0

2025

Las Vegas Aviators

6.13

1.60

124

119.0

2026

Las Vegas Aviators

5.16

1.57

66.1

Career

Totals

4.55

1.36

484

440.3

201

W-L

ERA

WHIP

28.2

0-4

8.79

1.88

W-L

ERA

WHIP

50.0

1-4

7.02

1.66