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MASON BARNETT
MASON BARNETT #63 - PITCHER - ATHLETICS
1-1  W-L  •
1.66  WHIP  •
6.85  ERA 
#63 - PITCHER - ATHLETICS
1-1 W-L
1.66 WHIP
6.85 ERA
MLB > ATHLETICS >

MASON BARNETT NEWS

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BIO

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VIDEOS

GAME LOG

INJURIES

Athletics' Mason Barnett Gets A Grip On A Key Pitch Type Mason Barnett struggled though most of 2025 but accomplished two things that set him up for future success. He made his MLB debut and found...
OCTOBER 23, 2025 • BASEBALLAMERICA.COM
Does fine in last start of season Barnett allowed three runs on three hits and two walks while striking out three over 5.2 innings in a no-decision versus the Royals on Friday.
Impact This was the longest of Barnett's five starts in the majors so far, and the lone mistake he made was a three-run home run by Jonathan India in the fourth inning. Through 22.1 innings in the majors, Barnett has posted a 6.85 ERA, 1.66 WHIP and 18:11 K:BB while also allowing three home runs. The right-hander will contend for a rotation spot next year, but he could be entering a crowded battle depending on how much turnover the Athletics go through in the offseason.
SEPTEMBER 27, 2025 • ROTOWIRE

Langeliers hits walk-off double, Wilson has 3 RBIs as Athletics beat Royals 4-3

Shea Langeliers hit a walk-off RBI double in the ninth inning, Jacob Wilson drove in three runs and the Athletics beat the Kansas City Royals 4-3
SEPTEMBER 27, 2025 • Associated Press
Another short start Wednesday Barnett didn't factor into the decision in Wednesday's loss against the Red Sox, allowing two runs on five hits and three walks while striking out two over four innings
Impact The rookie right-hander gave up a run in the first inning before serving up a solo homer to Rob Refsnyder in the second. While he managed to avoid further damage, Barnett has now surrendered 14 runs in just 16.2 innings since his call-up, struggling to find consistency at the major-league level to the tune of a 7.56 ERA, 1.92 WHIP and 15:9 K:BB across four starts. The 24-year-old has only tallied more than four innings once in those four outings. Barnett is slated to face the Astros in his next scheduled start.
SEPTEMBER 18, 2025 • ROTOWIRE

Athletics look to prolong win streak, play the Red Sox

The Athletics seek to extend a five-game win streak with a victory over the Boston Red Sox
SEPTEMBER 17, 2025 • Associated Press

Harris RBI single lifts Athletics over Red Sox 2-1 as Boston loses ground in AL wild-card race

Brett Harris had a go-ahead single in a two-run sixth inning and the Athletics rallied to beat the Boston Red Sox 2-1 for their first five-game winning streak in over a year
SEPTEMBER 17, 2025 • Associated Press
Short outing vs. Boston Barnett did not factor into the decision Wednesday against the Red Sox, allowing three runs on seven hits and a walk across 3.2 innings. He struck out four.
Impact Barnett's major-league career has gotten off to a rocky start -- the right-hander's given up 12 runs across 12.2 innings in his first three starts. Barnett is currently scheduled to face the Red Sox again on the road in his next start, though it's unclear how long he'll remain in the rotation with Jacob Lopez (elbow) expected to return before the end of the season.
SEPTEMBER 11, 2025 • ROTOWIRE
Short outing vs. Boston Barnett did not factor into the decision Wednesday against the Red Sox, allowing three runs on seven hits and a walk across 3.2 innings. He struck out four.
Impact Barnett's major-league career has gotten off to a rocky start -- the right-hander's given up 12 runs across 12.2 innings in his first three starts. Barnett is currently scheduled to face the Red Sox again on the road in his next start, though it's unclear how long he'll remain in the rotation with Jacob Lopez (elbow) expected to return before the end of the season.
SEPTEMBER 11, 2025 • ROTOWIRE

Kurtz, Butler power A's past Red Sox 5-4, end Chapman's hitless streak of 50 batters, 17 appearances

Nick Kurtz joined Jose Canseco and Mark McGwire as the only Athletics rookies to hit 30 home runs and Lawrence Butler hit a ninth-inning walk-off single in a 5-4 win over the Bosto...
SEPTEMBER 10, 2025 • Associated Press

Red Sox bring 3-game win streak into game against the Athletics

The Boston Red Sox are looking to extend a three-game win streak with a victory over the Athletics
SEPTEMBER 10, 2025 • Associated Press

Early strikes out 11, tying Red Sox record for debut, as Boston tops A's 6-0 to close on Yankees

Connelly Early struck out 11 to tie the Red Sox record for a major league debut, and Boston beat the Athletics 6-0 to close on the New York Yankees for the top AL wild card
SEPTEMBER 10, 2025 • Associated Press
Collects first win Barnett (1-1) allowed four runs on three hits and five walks while striking out eight over five innings to earn the win versus the Angels on Friday.
Impact The Athletics' third-inning explosion gave Barnett enough run support, and the rookie right-hander was able to grind out five innings on 102 pitches (55 strikes) to secure his first win in the majors. It was still far from an encouraging performance for the 24-year-old, who has now given up nine runs with a 9:5 K:BB over his first nine innings in the majors. The Athletics are far out of the wild-card race and have a handful of injuries in the rotation, so there's some room for Barnett to learn on the job. He's tentatively projected to make his next start at home versus the Red Sox.
SEPTEMBER 6, 2025 • ROTOWIRE
Collects first win Barnett (1-1) allowed four runs on three hits and five walks while striking out eight over five innings to earn the win versus the Angels on Friday.
Impact The Athletics' third-inning explosion gave Barnett enough run support, and the rookie right-hander was able to grind out five innings on 102 pitches (55 strikes) to secure his first win in the majors. It was still far from an encouraging performance for the 24-year-old, who has now given up nine runs with a 9:5 K:BB over his first nine innings in the majors. The Athletics are far out of the wild-card race and have a handful of injuries in the rotation, so there's some room for Barnett to learn on the job. He's tentatively projected to make his next start at home versus the Red Sox.
SEPTEMBER 6, 2025 • ROTOWIRE
Barnett bounces back to earn first MLB victory ANAHEIM – Mason Barnett notched his first Major League win in Friday’s 10-4 Athletics victory over the Angels at Angel Stadium, and it came...
SEPTEMBER 6, 2025 • MLB.COM

Athletics erupt for seven runs in third inning of a 10-4 win over Angels

JJ Bleday hit a three-run homer during a seven-run third inning, Mason Barnett recovered after giving up four runs in the first inning, and the Athletics beat the Los Angeles Angel...
SEPTEMBER 6, 2025 • Associated Press
Receiving another start Barnett is slated to start Friday's game against the Angels in Anaheim.
Impact After being called up from Triple-A Las Vegas, Barnett made his first MLB start this past Saturday, taking a loss to the Rangers while allowing five earned runs on eight hits and no walks over four innings. The 25-year-old righty will get a chance to redeem himself Friday, but another poor showing could put him at risk of losing his spot in the Athletics rotation.
SEPTEMBER 5, 2025 • ROTOWIRE

Athletics visit the Angels to start 3-game series

The Los Angeles Angels host the Athletics to begin a three-game series
SEPTEMBER 5, 2025 • Associated Press

Contreras drives in 4 runs in the Cardinals' 5-1 win over the Athletics

Willson Contreras had three hits and four RBIs, Nolan Gorman homered and Matthew Liberatore pitched 5 1/3 shutout innings in the St. Louis Cardinals’ 5-1 victory over the Athletics...
SEPTEMBER 4, 2025 • Associated Press
Barnett flashes power and command in MLB debut WEST SACRAMENTO – There was a palpable excitement in the building on Saturday afternoon for the Major League debut of Mason Barnett, one of...
AUGUST 31, 2025 • MLB.COM
Poor first impression in debut Barnett (0-1) allowed five runs on eight hits and struck out one without walking a batter over four-plus innings to take the loss versus the Rangers on Saturday.
Impact Barnett gave up three runs in the second inning, and he was chased in the fifth after Wyatt Langford's solo home run. Barnett was limited to 66 pitches (42 strikes) in his major-league debut. He has a 5.83 ERA and 123:60 K:BB across 117.1 innings with Triple-A Las Vegas this year, which doesn't bode well for his performance in the majors. If he gets another start, which is possible due to the numerous injuries in the Athletics' rotation, he's tentatively projected to face the Angels on the road.
AUGUST 31, 2025 • ROTOWIRE

Rangers get 17 hits and hammer Athletics 9-3 for 4th straight win

Josh Jung had three hits, including a pair of RBI doubles, and Merrill Kelly pitched into the seventh inning as the surging Texas Rangers defeated the Athletics 9-3 for their fourt...
AUGUST 31, 2025 • Associated Press

Rangers take 3-game win streak into matchup with the Athletics

The Texas Rangers will try to prolong a three-game win streak with a victory against the Athletics
AUGUST 30, 2025 • Associated Press

Rangers power past Athletics with home runs from Heim and Helman

Jonah Heim and rookie Michael Helman hit home runs to back a strong start by Jack Leiter, and the Texas Rangers beat the Athletics 5-2
AUGUST 30, 2025 • Associated Press
Making major-league debut Saturday Athletics manager Mark Kotsay said Friday that Barnett will start against the Rangers on Saturday, Jessica Kleinschmidt of Baseball America reports.
Impact Barnett has spent most of the 2025 season with Triple-A Las Vegas, where he has a 6-1 record across 24 games (22 starts) with a 5.83 ERA, 1.56 WHIP and 123:60 K:BB across 117.1 innings. He was called up by the Athletics on Tuesday following Jacob Lopez's (elbow) placement on the IL, and Barnett is lined up to make his major-league debut against a Rangers team that ranks 26th in the majors with a .305 OBP.
AUGUST 29, 2025 • ROTOWIRE
Selected from Vegas The Athletics selected Barnett's contract from Triple-A Las Vegas on Tuesday.
Impact The 24-year-old Barnett has spent the entire season at Las Vegas, turning in a 5.83 ERA and 1.56 WHIP across 117.1 innings through 24 appearances (22 starts). Despite his unimpressive statline, he'll join the big-league roster for the first time in his career to fill in for Jacob Lopez (elbow), who landed on the IL in a corresponding move. If Barnett takes Lopez's place in the Athletics' rotation, the former would be lined up to make his MLB debut Saturday against Texas. Otherwise, he could be used as a multi-inning relief option.
AUGUST 26, 2025 • ROTOWIRE
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