The Rays dealt Peters to Chicago for cash consideration on December 18. MLB Trade Rumors commenters responded with leap-year birthday jokes. Seven months later he hit for the cycle, made the AL All-Star team, and is hitting .303 on a first-place club five days from the deadline.

On December 18, 2025, the Tampa Bay Rays designated outfielder Tristan Peters for assignment to clear a roster spot for Steven Matz's two-year deal, then traded him to the White Sox for cash or a player to be named later. Cash consideration. The floor of trade compensation.

The MLB Trade Rumors comment section responded with appropriate gravity. One commenter noted Peters had technically only "celebrated 6 birthdays" — he was born on February 29. Another predicted he'd "age four years for every season in Chicago." A third compared him to Adrian Houser.

The box score on July 10, 2026 had a different accounting.

Peters doubled in the third inning against the Athletics at Rate Field. He singled in the fifth. In the seventh, he hit a two-run homer to center and an RBI triple — the final leg of the first White Sox cycle since José Abreu turned one in 2017, only the seventh in franchise history. Hours later, he was named to the American League All-Star roster, replacing injured Oakland first baseman Nick Kurtz.

That's the whole transaction repriced in one afternoon.

Peters came to the Sox as a lefty-hitting corner outfielder who had logged four major-league games with Tampa Bay in 2025, going 0-for-12 with seven strikeouts. His Triple-A numbers at Durham — .266/.355/.429 with 15 home runs in 555 plate appearances — were interesting enough on contact rate and walk rate, but his exit velocities were subpar and his ceiling read as organizational depth. The Sox had roster spots. They spent essentially nothing and bought an option.

By mid-July 2026, that option had converted into a .303 hitter with a .841 OPS and 20 doubles. The jump — from DFA'd fringe piece to All-Star — is the kind of projection beat that most transaction trackers undervalue by design, because the denominator (cash consideration) makes the expected return near-zero and the math doesn't care about the distribution of outcomes, only the median.

The White Sox front office, now in buying mode with the August 3 deadline five days out, identified Peters when the market had already discarded him. That's the scouting credit that belongs in the ledger alongside whatever name they acquire this week. Chicago already has one free-agent-quality piece it got for free. The department that found him is the same one now shopping.

The leap-year jokes aged exactly four years in seven months.