Headlines

  • Astros Reinstate Yordan Alvarez From Injured List
  • Guardians Place Carlos Santana On Outright Waivers
  • Nathan Eovaldi Likely Out For Season Due To Rotator Cuff Strain
  • Mets To Promote Jonah Tong
  • Pirates Designate Andrew Heaney For Assignment
  • BBWAA To Institute Relief Pitcher Of The Year Award In 2026
  • Previous
  • Next
Register
Login
  • Hoops Rumors
  • Pro Football Rumors
  • Pro Hockey Rumors

MLB Trade Rumors

Remove Ads
  • Home
  • Teams
    • AL East
      • Baltimore Orioles
      • Boston Red Sox
      • New York Yankees
      • Tampa Bay Rays
      • Toronto Blue Jays
    • AL Central
      • Chicago White Sox
      • Cleveland Guardians
      • Detroit Tigers
      • Kansas City Royals
      • Minnesota Twins
    • AL West
      • Houston Astros
      • Los Angeles Angels
      • Oakland Athletics
      • Seattle Mariners
      • Texas Rangers
    • NL East
      • Atlanta Braves
      • Miami Marlins
      • New York Mets
      • Philadelphia Phillies
      • Washington Nationals
    • NL Central
      • Chicago Cubs
      • Cincinnati Reds
      • Milwaukee Brewers
      • Pittsburgh Pirates
      • St. Louis Cardinals
    • NL West
      • Arizona Diamondbacks
      • Colorado Rockies
      • Los Angeles Dodgers
      • San Diego Padres
      • San Francisco Giants
  • About
    • MLB Trade Rumors
    • Tim Dierkes
    • Writing team
    • Advertise
    • Archives
  • Contact
  • Tools
    • 2025-26 MLB Free Agent List
    • 2026-27 MLB Free Agent List
    • Contract Tracker
    • Transaction Tracker
    • Agency Database
  • NBA/NFL/NHL
    • Hoops Rumors
    • Pro Football Rumors
    • Pro Hockey Rumors
  • App
  • Chats
Go To Pro Hockey Rumors
Go To Hoops Rumors

Mason Barnett

Athletics Select Mason Barnett

By Darragh McDonald | August 26, 2025 at 4:40pm CDT

The Athletics announced that left-hander Jacob Lopez has been placed on the 15-day injured list due to a flexor strain in his left elbow, a move that was reported yesterday. Right-hander Mason Barnett has been selected in a corresponding move. The 40-man roster had a vacancy due to Luis Urías being designated for assignment earlier this week.

Barnett, 24, gets the call to the big leagues for the first time. A third-round pick of the Royals in 2022, he was one of three players who came to the A’s as part of last year’s deadline deal which sent Lucas Erceg to Kansas City.

The A’s have given Barnett his first taste of the Triple-A level this year, though the results haven’t been amazing. He has tossed 119 innings over 23 starts and two long relief appearances with a 6.13 earned run average. Part of that might be the hitter-friendly environment of the Pacific Coast League, as his 15.6% home run to fly ball rate is far higher than any other stop in his career. His 22.8% strikeout rate is close to average, though his 11.9% walk rate is a few ticks north of par.

Despite the uninspiring numbers, Baseball America still lists him as the #9 prospect in the system while MLB Pipeline has him in the #11 slot. Both outlets give him a shot at becoming a mid-rotation starter at some point, highlighting his pitch mix. His four-seamer sits in the mid-90s and he also throws a sweeper, curveball and changeup. He was going to be eligible for the Rule 5 draft this winter and would need a 40-man spot to be protected, so the A’s are giving it to him now.

It’s unclear if the A’s plan on dropping Barnett right into the rotation or perhaps having him begin his career in a long relief role. The Lopez injury does open up a rotation job but the club is off on Thursday and doesn’t play more than six games in a row for the rest of the season. They could run with a four-man rotation of Jeffrey Springs, J.T. Ginn, Osvaldo Bido and Luis Morales along with occasional bullpen games. Guys like Barnett, Joey Estes and Eduarniel Núñez could take on bulk roles. The A’s could also recall arms such as Ken Waldichuk or Mitch Spence with rosters expanding in September.

Photo courtesy of Rick Scuteri, Imagn Images

Share 0 Retweet 0 Send via email0

Oakland Athletics Transactions Jacob Lopez Mason Barnett

5 comments
Show all
    Top Stories

    Astros Reinstate Yordan Alvarez From Injured List

    Guardians Place Carlos Santana On Outright Waivers

    Nathan Eovaldi Likely Out For Season Due To Rotator Cuff Strain

    Mets To Promote Jonah Tong

    Pirates Designate Andrew Heaney For Assignment

    BBWAA To Institute Relief Pitcher Of The Year Award In 2026

    Zack Wheeler Recommended For Thoracic Outlet Syndrome Surgery

    Frankie Montas Done For 2025 Due To “Pretty Significant” UCL Injury

    Orioles Extend Samuel Basallo

    Astros Sign Craig Kimbrel

    Pirates Promote Bubba Chandler

    Evan Carter Diagnosed With Fractured Wrist

    Blue Jays Activate Shane Bieber

    MLB, ESPN Nearing Deal Involving MLB.TV And In-Market Rights For Five Clubs

    Rays Promote Carson Williams

    Red Sox To Promote Jhostynxon Garcia, Place Wilyer Abreu On IL

    Kyle Tucker Was Diagnosed With Hairline Hand Fracture In June

    Félix Bautista Undergoes Shoulder Surgery, Expected To Miss 12 Months

    Phillies Place Zack Wheeler On Injured List With Blood Clot

    Red Sox Finalizing Deal With Nathaniel Lowe

    Recent

    Latest On Red Sox’s Rotation

    Dodgers Place Alex Vesia On Injured List

    Giants Notes: Rodriguez, Walker, Roupp, Eldridge

    Willson Contreras Issued Six-Game Suspension

    Mets Reportedly Place Ty Adcock On Waivers

    Athletics Select Mason Barnett

    Orioles To Select Roansy Contreras

    Astros Reinstate Yordan Alvarez From Injured List

    Rangers, Dylan Moore Agree To Minor League Deal

    Phillies Release Joe Ross, Place Jordan Romano On Injured List

    MLBTR Newsletter - Hot stove highlights in your inbox, five days a week

    Latest Rumors & News

    Latest Rumors & News

    • Every MLB Trade In July
    Trade Rumors App for iOS and Android App Store Google Play

    MLBTR Features

    MLBTR Features

    • Remove Ads, Support Our Writers
    • Front Office Originals
    • Front Office Fantasy Baseball
    • MLBTR Podcast
    • 2025-26 MLB Free Agent List
    • 2026-27 MLB Free Agent List
    • Contract Tracker
    • Transaction Tracker
    • Extension Tracker
    • Agency Database
    • MLBTR On Twitter
    • MLBTR On Facebook
    • Team Facebook Pages
    • How To Set Up Notifications For Breaking News
    • Hoops Rumors
    • Pro Football Rumors
    • Pro Hockey Rumors

    Rumors By Team

    • Angels Rumors
    • Astros Rumors
    • Athletics Rumors
    • Blue Jays Rumors
    • Braves Rumors
    • Brewers Rumors
    • Cardinals Rumors
    • Cubs Rumors
    • Diamondbacks Rumors
    • Dodgers Rumors
    • Giants Rumors
    • Guardians Rumors
    • Mariners Rumors
    • Marlins Rumors
    • Mets Rumors
    • Nationals Rumors
    • Orioles Rumors
    • Padres Rumors
    • Phillies Rumors
    • Pirates Rumors
    • Rangers Rumors
    • Rays Rumors
    • Red Sox Rumors
    • Reds Rumors
    • Rockies Rumors
    • Royals Rumors
    • Tigers Rumors
    • Twins Rumors
    • White Sox Rumors
    • Yankees Rumors

    Navigation

    • Sitemap
    • Archives
    • RSS/Twitter Feeds By Team

    MLBTR INFO

    • Advertise
    • About
    • Commenting Policy
    • Privacy Policy

    Connect

    • Contact Us
    • Twitter
    • Facebook
    • RSS Feed

    MLB Trade Rumors is not affiliated with Major League Baseball, MLB or MLB.com

    Do not Sell or Share My Personal Information

    hide arrows scroll to top

    Register

    Desktop Version | Switch To Mobile Version