The Giants selected Jonah Cox from Double-A Richmond on May 31, 2026, giving the 24-year-old outfielder his first shot at the majors and clearing the path for his MLB debut the next time he appears in a game. Ryan Borucki was designated for assignment to make room on the roster.
The move gives San Francisco a player whose speed and defense were viewed as big-league ready, and it comes at a moment when the club can use both. The Giants rank last in baseball in stolen bases, and Cox arrived after hitting.400/.453/.644 with six home runs and 27 steals in 34 attempts over 183 Double-A plate appearances in Richmond. He also cut his strikeout rate to 16.9 percent there, a sign that the bat was catching up to the legs that made him stand out in the first place.
That is why the promotion feels aggressive even by modern standards. Cox has not yet had a look at Triple-A, which means the jump is straight from Double-A pitching to major league arms. The Giants are betting the speed can play now and the glove will hold up while the bat adjusts, but there is no way around the learning curve that comes with skipping a level entirely.
Cox was a sixth-round pick by the Athletics in the 2023 draft before Oakland traded him to San Francisco in February 2024 in the deal that sent Ross Stripling to the A’s. Baseball America ranked him 21st among Giants prospects, and this promotion is the clearest sign yet that the organization sees him as more than a distant piece of depth.
The roster shuffle did not stop with Borucki. Will Brennan was optioned to Triple-A, and Tristan Beck was recalled, underscoring that the Giants are still searching for the right mix while trying to spark a lineup that has struggled to create damage on the bases. The unanswered piece now is playing time: if Cox does not get regular at-bats, his debut may arrive before the full impact of his speed can be felt. Even so, San Francisco has put him in position to matter immediately, and the first time he steps into a big league game, the long climb from Richmond will be over.
