Diamondbacks Release Seth Brown

The Diamondbacks have released outfielder and first baseman Seth Brown, according to the transaction log on his MLB.com player page. He had signed a minor league contract with the team in July after being released by the Athletics.

Brown, 33, played the first decade of his professional career in the A’s organization. They drafted him in 2015 and promoted him for his MLB debut four years later. He spent time with the big league club in each of the next seven seasons. The lefty batter established himself as a solid platoon slugger in 2021, hitting 19 home runs with a .498 slugging percentage in 281 PA against right-handed pitching. After trading away several key pieces over the subsequent offseason (including All-Star first baseman Matt Olson), the Athletics had more playing time for Brown in 2022. Splitting his time between first base and the outfield, he played almost every day, which meant facing left-handers more often. Southpaws continued to neutralize his bat, but he hit well enough against righties that it hardly mattered. He finished his first full season with 25 home runs and a 115 wRC+ in 150 games.

Unfortunately for Brown, his power numbers dipped in 2023 and ’24. It’s not that he was an awful hitter – he still hit 14 home runs each year – but as a player whose only asset is power against right-handed pitching, he needed to crush righties to continue earning regular playing time. He wasn’t able to do that, ultimately posting a .676 OPS, a 91 wRC+, and -0.7 FanGraphs WAR in 236 games over those two years.

Brown made the Athletics’ Opening Day roster again in 2025, but he started the year off hitting even worse than he had in the two years prior. With better options to play first base, DH, and the outfield, as well as several young and exciting lefty bats, the A’s no longer had a job for the struggling Brown. They designated him for assignment in May. He accepted an outright assignment and stuck around in the organization, tearing the cover off the ball in Triple-A. The A’s then selected his contract again just two weeks later. However, he injured his elbow another week after that, and the team never brought him back from the IL. He passed through waivers unclaimed once again at the end of June, and this time, with just enough service time to retain all of the salary remaining on his $2.7MM contract, he elected free agency.

The Diamondbacks gave Brown a minor league deal in early July. After hitting reasonably well for the Triple-A Reno Aces, he triggered an upward mobility clause in his contract on August 1, forcing the D-backs to notify the other 29 teams that he was available for any that wanted to add him to their 40-man roster. Evidently, no other club expressed interest, as Brown continued to play for Reno through yesterday’s game against the Tacoma Rainiers.

It’s now been several years since Brown was a productive big league bat. However, perhaps his success from 2021-22 – and his 1.113 OPS and 159 wRC+ in 35 Triple-A games this year – will entice another organization looking for lefty depth to give him a shot on a minor league deal.