The Giants acquired outfielder Joey Wiemer from the Marlins in exchange for cash, per the team. Miami designated the former top prospect for assignment earlier in the week when setting its roster ahead of the deadline to protect players from the Rule 5 Draft. San Francisco designated catcher Andrew Knizner for assignment in a corresponding roster move.
Now 26 years old, Wiemer was the Brewers’ fourth-round pick in 2020. He appeared on the back end of MLB.com’s top-100 prospect list in both 2022 and 2023 but has seen his stock dwindle since that time. Milwaukee flipped him to the Reds alongside Jakob Junis in the 2024 Frankie Montas trade, and Cincinnati subsequently dealt him to Kansas City with Jonathan India in exchange for right-hander Brady Singer. The Marlins scooped him up off waivers in early August, shortly following this year’s trade deadline.
Wiemer has appeared in parts of three major league seasons between the Brewers, Reds and Marlins. He popped 13 homers and swiped 11 bags as a rookie in ’23 but did so with poor rate stats. He’s a career .205/.279/.359 hitter through 499 trips to the batter’s box in the majors. That said, he’s shown plenty of pop against lefties, albeit with still-shaky OBP skills; in 173 plate appearances versus southpaws, the righty-swinging Wiemer is a .255/.298/.484 hitter (106 wRC+).
Beyond his above-average power versus lefties, Wiemer is capable of playing all three outfield spots and doing so at a fairly high level. Even bearish scouting reports on him over the years have labeled him as a potential plus defender. Defensive metrics bear that out. Wiemer has positive marks in all three spots individually and a collective 11 Defensive Runs Saved and 7 Outs Above Average in 1249 innings of outfield work at the big league level.
Wiemer is out of minor league options, so he’ll need to stay on San Francisco’s 40-man roster all offseason and break camp with the team or else be designated for assignment once again. He can’t be sent to the minors without first passing through waivers. For now, he projects as a possible bench option who could platoon with lefty-swinging Drew Gilbert in right field — if the Giants don’t make a larger-scale addition at the position. Former top prospects Luis Matos and Marco Luciano could compete for a similar role, but both hit poorly in 2025 and have seen their once lofty prospect stock crater in recent years. Like Wiemer, both Matos and Luciano are out of minor league options, so at least two of the three figure to be roster casualties between now and Opening Day.
Knizner, 31 in February, was eligible for arbitration and projected by MLBTR contributor Matt Swartz to earn $1.3MM next year. The journeyman backstop hit .221/.299/.299 in 88 trips to the plate with the Giants this season. He’s improved upon formerly poor framing grades in recent seasons but struggles to block pitches in the dirt and control the run game. Knizner is a career .211/.281/.316 hitter in 975 plate appearances during his big league career.
The Giants can spend the next couple hours looking for a trade partner, though they’ve presumably already been doing so without success. If there’s no trade opportunity, he’ll be non-tendered prior to tonight’s 5pm ET deadline.
Susan Slusser of the San Francisco Chronicle first reported that the Giants were acquiring Wiemer. Jon Heyman of the New York Post first reported Knizner’s DFA.
