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FanGraphs Weekly Mailbag: September 5, 2026

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Job Posting: Texas Rangers – Apprentice, Baseball Research & Development

Apprentice, Baseball Research & Development Department: Baseball R&D JOB SUMMARY: The Texas Rangers are seeking candidates for an Apprenticeship in Baseball Analytics based in Arlington, TX. ESSENTIAL FUNCTIONS OF POSITION INCLUDE, BUT ARE NOT LIMITED TO THE FOLLOWING: Query and report on data Build and maintain analytical tools, metrics, & models Create compelling data visualizations and stories Research game changing ideas and concepts Present information to team leaders and organizational stakeholders All other duties as assigned. PREFERRED QUALIFICATIONS: Bachelor’s Degree in mathematics, engineering, computer science, data science, or related field Strong knowledge of baseball analytics and associated data & technologies Proficiency in Python, SQL, R, Shiny and/or other analytical tools Familiarity with concepts such as predictive modelling, cloud computing, machine learning, artificial intelligence, and Bayesian analysis Strong written & v...

Scouting Ketel Marte’s Rehab and Jackson Flora’s Pro Debut

Mark J. Rebilas-Imagn Images On Thursday, I woke up to a text warning me that first pitch of the Diamondbacks-Giants Bridge League game had moved up to 10 AM local time – presumably due to the heat, our morning low on Thursday was 95 degrees and cranked up to 113 – and that a rehabbing Ketel Marte was in the lineup. The change in schedule meant I could spend an hour watching Ketel and Co., then slip over to the Rockies’ side of the Salt River Fields Complex to catch a second game. Rehabbers typically hit every inning, so I hoped to squeeze in three Marte at-bats before changing locations. And that’s how things panned out. Marte flied out to left field in the first, he crushed an oppo-gap double against a 96-mph fastball in the second (and looked fine getting up to speed as he rounded first base) and grounded out to first base in the third. You can watch the entire game here , but this is what Marte’s double looked like from the perspective of my camera:

Sunday Notes: Tristan Peters Has Been a Pleasant Surprise on the South Side

Tristan Peters was a 22-year-old San Francisco Giants outfield prospect when he was first featured here at FanGraphs in August 2022. Drafted in the seventh round the previous year out of Southern Illinois University, he had recently been acquired from the Milwaukee Brewers at the trade deadline in exchange for Trevor Rosenthal . His profile was modest. While he possessed potential, Peters was nonetheless unranked, with plenty of raw edges to be smoothed out if he hoped to one day reach The Show. It took time, but his once-raw tools are now are shining brightly on Chicago’s South Side. Now with his fourth organization — the White Sox purchased his contract from the Tampa Bay Rays over the offseason — Peters is thriving to the tune of a .279/.344/.468 slash line, a dozen home runs, and a 128 wRC+ over 408 plate appearances. Moreover, he went deep for the fifth straight game on Thursday, tying a franchise record held by seven other players. Munetaka Murakami is among them, having turn...

MLB’s Latest CBA Proposal Offers Thought-Provoking Hypotheticals, Even if It Is DOA

Mike Watters-Imagn Images As Pete Crow-Armstrong authors his breakout season and Chris Sale side-eyes Laz Diaz , the battle for the future of baseball rolls quietly on in the background. On Thursday, MLB delivered to the MLB Players Association its latest set of proposals for the next collective bargaining agreement . This is news for nerds and diehards — you either have to love the minutiae of labor relations or have a vested interest in the structure of the Rule 5 draft to get excited about this stuff. Fortunately, I know what my audience is. MLB’s new proposals concern three areas: The creation of a weekly roster change window, a more aggressive Rule 5 draft, and the creation of free agent blackout periods during the offseason. Let’s deal with each in turn. Currently, teams set their active roster daily, and can make changes before and after every game. MLB wants to change that to a weekly structure; every club would have to set its 26-man roster on Monday and live with it th...

RosterResource Chat – 8/27/26

2:03 Jason Martinez : Welcome to the RosterResource chat! 5 more days until rosters expand to 28 and 1 more month until regular season ends and I start work on offseason pages. My expectation is that this offseason will be similar to the last one that was interrupted by a lockout … roster chaos right before the CBA expired and more roster chaos after the lockout ended. Fun. Stress. Relief. More fun. Here we go … 2:04 Christopher : I think I know the answer, but Fried can’t be added as the 27th man Saturday only for someone else to be sent out after, right? Assuming they need Elmer for another start before the off day, I guess that means a reliever sent out for Fried and another added as Man 27? 2:06 Jon Becker : He could be the 27th man in name only, actually — we just saw the Twins do this with Buxton for the Field of Dreams game. But I think it’s likelier that Fried starts game 2 so they can activate him in between games rather than...

Scouting Notes on the Rehabbing Cubs and Diamondbacks Pitchers

Eric Longenhagen-FanGraphs I had Tuesday’s Cubs-Diamondbacks Bridge League game circled on the calendar. Chicago’s big league squad is in town this week (for a series that has become spicy ), and I thought this meant the organization’s recently drafted pitchers might throw in front of traveling Cubs brass who could see their new talent in the morning before heading to Chase Field for the second game of that series. “Bridge League,” for those unfamiliar, is a fairly informal, month-long slate of backfield games that take place at the spring training complexes between the end of the Arizona and Florida Complex League schedules and the end of the other minor seasons in September. It mostly exists to give newly drafted players a soft landing spot to start their pro careers. But instead of a first glimpse at Cade Townsend or Carson Jasa, I ran into multiple, big-name rehabbers from both clubs: Justin Steele (who threw a live BP) and Ben Brown of the Cubs, and Corbin Burnes and Za...