Mason Barnett#63

Athletics·BBRef

RSFree agentFLBFree agent

Pos: Pitcher

B/T: R / R

Born: Nov 7, 2000 (25)

Height: 6' 0"

Weight: 218 lbs

Owned: 0.1%

From: Kennesaw, GA

Drafted: 2022

Mason Barnett

#63

Athletics BBRef

RSFree agentFLBFree agent

Position: Pitcher

Bats/Throws: R / R

Born: Nov 7, 2000 (25)

Height: 6' 0"

Weight: 218 lbs

Owned: 0.09%

From: Kennesaw, GA

Drafted:

G	GS	IP	W-L	ERA	WHIP	K	BB	SV	K/9	K/BB	FIP
19	5	44.0	1-4	7.16	1.75	42	28	2	8.6	1.50	6.78

Barnett did not factor into Friday's decision against Cleveland, allowing three runs on seven hits and four walks while striking out four across 3.1 innings.

1d agoRotowire

Barnett was promoted from Triple-A Las Vegas ahead of Friday's start, his fifth of the season and 10th of his major-league career. He kept the Guardians off the board through the first three innings but proceeded to allow four of the first five batters he faced in the fourth on base, resulting in three runs scored for Cleveland. Barnett has allowed at least three earned runs in six of his last seven major-league outings, and he has a 7.16 ERA and 1.75 WHIP across 44 innings this season. Assuming he stays with the big club, Barnett is lined up to face the Astros at home next weekend.

The Athletics recalled Barnett from Triple-A Las Vegas on Friday.

1d agoRotowire

Barnett will start Friday's game against Cleveland, and Joe Rock has been optioned to Las Vegas in a corresponding move. Barnett has appeared in 18 games with the Athletics this season, making four starts, and owns an ugly 7.08 ERA, 1.62 WHIP and 38:24 K:BB across 40.2 innings. He's started each of his last four appearances with the club and has functioned as a starter in Triple-A, so Barnett should be stretched out.

The Athletics will recall Barnett from Triple-A Las Vegas to start Friday's game against the Guardians, Martin Gallegos of MLB.com reports.

2d agoRotowire

Barnett owns a 7.08 ERA and 1.62 WHIP through 40.2 innings in the majors this season. He hasn't fared much better in four starts since returning to the minors in mid-August (6.97 ERA, 1.84 WHIP), though he delivered a nine-inning, two-run gem for Las Vegas his last time out Saturday. He'll be welcomed back to the big leagues by a Guardians lineup that's been trending upward while posting a .748 OPS over its last 10 games.

The Athletics optioned Barnett to Triple-A Las Vegas on Tuesday.

Aug 18Rotowire

The transaction comes one day after Barnett was lit up for six runs over 2.2 innings in a loss to the Royals. With Jeffrey Springs (hip) slated to rejoin the Athletics' rotation this week, Barnett will lose his spot among the starting five and has now logged a 7.08 ERA, 1.62 WHIP and 38:24 K:BB over 40.2 frames in 2026.

Barnett (1-4) took the loss against the Royals on Monday, allowing six runs on seven hits and four walks in 2.2 innings. He struck out two.

Aug 18Rotowire

Barnett struggled mightily Monday, landing only 45 of his 83 pitches for strikes in a laborious outing. The right-hander isn't making a strong case to maintain his rotation spot once Jeffrey Springs (hip) returns from the injured list, surrendering three runs or more in four consecutive appearances while failing to log a quality start during that span. Through 40.2 innings, Barnett has a poor 7.08 ERA, 1.62 WHIP and 38:24 K:BB.

Poor

Below Avg

Average

Above Avg

Elite

xERA

7

5.38

xBA

28

.255

Fastball Velo

58

94.9 mph

Avg Exit Velo

23

89.7 mph

Chase %

8

26.0%

Whiff %

23

21.8%

K %

36

20.5%

BB %

4

13.7%

Barrel %

22

9.0%

Hard-Hit %

50

38.3%

Mason Barnett#63

Mason Barnett

2026 Season

Player News

Barnett did not factor into Friday's decision against Cleveland, allowing three runs on seven hits and four walks while striking out four across 3.1 innings.

The Athletics recalled Barnett from Triple-A Las Vegas on Friday.

The Athletics will recall Barnett from Triple-A Las Vegas to start Friday's game against the Guardians, Martin Gallegos of MLB.com reports.

The Athletics optioned Barnett to Triple-A Las Vegas on Tuesday.

Barnett (1-4) took the loss against the Royals on Monday, allowing six runs on seven hits and four walks in 2.2 innings. He struck out two.

Percentile Rankings

Year by Year

Batting Splits

Splits

vs Batters: Left-Handed

vs Batters: Right-Handed

Rolling Performance

Season Average

Last 7 Days

Last 14 Days

Last 30 Days

Year	G	GS	W	L	SV	IP	H	HR	BB	K	ERA	WHIP
2025ATH	5	5	1	1	0	22.1	26	3	11	18	6.85	1.66
2026ATH	19	5	1	4	2	44.0	49	12	28	42	7.16	1.75
Career	24	10	2	5	2	66.1	75	15	39	60	7.06	1.72