Marlins add Holt Jones, Jack Sellinger to Arizona Fall League plans

There have been a few changes since the preliminary Mesa Solar Sox roster was announced last month. The Miami Marlins will actually send eight players to the desert instead of seven, with right-handed reliever Holt Jones and left-hander Jack Sellinger recently being added to the group. Another reliever, righty Xavier Meachem, will not participate as originally hoped after undergoing elbow surgery.

Selected by the Marlins in the 14th round of the 2021 MLB Draft, Jones spent his entire age-26 season with High-A Beloit. He posted a 4.75 ERA and 26.3% strikeout rate in 47 ⅓ innings pitched (34 G/0 GS). Jones' lack of control continues to be a major concern—he walked 17.8% of opponents and also hit 10 batters while locating only 57% of his pitches for strikes.

Sellinger was Jones' Sky Carp teammate for most of 2025 before earning a late-season promotion to Double-A Pensacola. The 25-year-old quietly had an excellent campaign out of the 'pen. The UNLV product finished with a 2.30 ERA and 32.0% strikeout rate in 66 ⅔ innings pitched (40 G/0 GS). He has a sinker/slider/sweeper/changeup pitch mix, with the slider being his best weapon. Whereas everybody else that the Marlins are sending to the AFL had an injury absence of some kind this season, Sellinger did not.

The rest of the originally announced Marlins delegation is still playing: Starlyn Caba (Fish On First's #9 prospect), PJ Morlando (FOF #16), Fenwick Trimble (FOF #20), Aiden May and Darwin Rodríguez.

The Solar Sox's season opener is on Tuesday at Sloan Park (9:30 p.m ET first pitch). You can livestream it for free here.