Tristan Peters reportedly designated for assignment by Rays, acquired by White Sox

Tristan Peters was reportedly designated for assignment by the Tampa Bay Rays in December, then acquired by the Chicago White Sox, who purchased his contract over the offseason, per FanGraphs. The outfielder is now with his fourth organization after stints in the Milwaukee, San Francisco, and Tampa Bay systems.

What happened

The Rays reportedly removed Peters from their 40-man roster in December, FanGraphs reported. The White Sox then purchased his contract over the offseason, adding him to their organization. Peters had been unranked as a prospect when he was featured at FanGraphs in August, shortly after the Giants acquired him from Milwaukee in exchange for Trevor Rosenthal at the trade deadline. He was originally drafted by the Brewers in the seventh round out of Southern Illinois University.

Why it matters

The transaction gave Peters a fresh opportunity with a rebuilding club, and he has seized it. FanGraphs reported that Peters is slashing .279/.344/.468 with a 128 wRC+ over 408 plate appearances this season. He recently homered in a fifth consecutive game, tying a franchise record held by seven other players, per the report. The profile that was once described as modest, with raw edges to be smoothed out, has developed into production on the South Side.

The move also illustrates the churn of the waiver wire and minor-league market. A player designated for assignment in December can resurface months later as a contributor elsewhere, particularly when a club with roster flexibility takes a low-cost chance. Peters had been with Tampa Bay's organization before the DFA, though the report does not specify how long he was in their system or at what level he was playing.

The numbers

FanGraphs reported Peters is slashing .279/.344/.468 with a 128 wRC+ over 408 plate appearances this season. The wRC+ figure indicates he has been 28 percent better than league average at the plate when park and league context are factored in. His recent five-game home run streak tied a White Sox franchise record shared by seven other players, including Munetaka Murakami.

The production represents a significant step forward for a player who was unranked as a prospect in August, when FanGraphs first profiled him. At that time, he possessed potential but was described as having plenty of raw edges. The intervening years, across multiple organizations, have evidently allowed those tools to develop.

His .279 batting average and .344 on-base percentage suggest he has made meaningful contact adjustments since his days as a seventh-round selection. The .468 slugging percentage, paired with the home run streak, points to power that has emerged as his raw tools have refined.

What we don't know yet

FanGraphs does not specify the financial terms of the contract purchase, nor does it detail Peters' minor-league assignment history with Tampa Bay before the designation. It is unclear whether Peters opened the season on Chicago's 40-man roster or was added later, and whether he began the year in the majors or was called up mid-season. The timing of his major-league debut with the White Sox, if this is his first stint in The Show, is not provided.

The report also does not indicate whether Peters has minor-league options remaining, which would affect Chicago's roster flexibility going forward. His performance suggests he has been with the big-league club for a substantial portion of the season, but the exact call-up date and any prior demotions are not detailed.

The nature of the designation for assignment process means Peters could have been claimed on waivers by another club before the White Sox purchased his contract, but FanGraphs does not specify whether he cleared waivers or was traded directly. The seven-day window following a DFA allows for multiple outcomes, and the report does not clarify which path Peters took from Tampa Bay to Chicago.

What to watch

Peters' ability to sustain his production will determine whether he remains a fixture in Chicago's lineup or becomes a trade candidate if the White Sox continue to rebuild. A 128 wRC+ over more than 408 plate appearances is a meaningful sample, and his power surge suggests he has unlocked something mechanically or developmentally that eluded him in previous organizations.

The September roster expansion will give Chicago additional roster maneuverability, though the report does not indicate whether Peters' spot is secure or subject to a platoon arrangement. His journey from a seventh-round pick to a DFA'd prospect to a productive major leaguer is the kind of arc that makes the waiver wire and minor-league market worth monitoring, particularly for clubs willing to take chances on players with tools that have yet to fully click.

Whether Peters can maintain his power output and on-base ability into the final month will shape his offseason outlook and his role in Chicago's plans. For now, he is one of the more pleasant surprises on the South Side, a player whose raw edges have been smoothed into something resembling a major-league regular. The fact that he was available for a contract purchase in the offseason, after being designated for assignment, speaks to how quickly a player's value can shift when the tools finally align.

The White Sox, in the midst of a rebuild, have little to lose by giving Peters playing time and every reason to see whether his breakout is sustainable. If it is, they have found a contributor at minimal cost. If it is not, they have lost nothing but at-bats that would have gone to another player in a season already devoted to evaluation. Either way, Peters' path from DFA to franchise record is a reminder that the waiver wire remains one of the more underappreciated avenues for roster construction.