SF Giants hope latest bold call-up can provide much-needed offensive jolt

The SF Giants called up prospect Jonah Cox directly from Double-A in a surprise move Sunday, the latest in a series of increasingly desperate transactions that they hope will inject some life into an offense that has sputtered through the first two months of the season.

Cox was not a highly rated prospect before this year – a former Athletics sixth-rounder, he failed to impress in his first minor league season and was shipped to the Giants for swingman Ross Stripling in a 2024 deal that was largely a salary dump for San Francisco. That move paid off for the Giants by freeing up space for their subsequent acquisition of Blake Snell, but Cox was mostly an afterthought in their future plans at the time. Now, a little more than two years later, he appears to be the next man up for a team with the fifth-worst center field production in MLB. How did that happen?

Jonah Cox brings interesting prospect pedigree to the table

Cox entered pro ball with an impressive resume, having starred at two different junior colleges before transferring to Division I Oral Roberts for his junior season in 2023. He was instantly the Golden Eagles' best player, slashing .412/.470/.646 with 11 home runs in 66 games and leading the nation with 114 hits en route to earning Summit League Player of the Year and consensus All-American honors. He also led them to the second College World Series appearance in school history, and first since 1978. In NCAA tournament play, he collected four multi-hit games and posted a .913 OPS as ORU became just the third #4 seed ever to advance to the CWS.

That standout season was enough for the A's to spend the 166th overall pick and a $300,000 signing bonus on Cox, and after tearing up the Arizona Complex League for seven games he was sent to low-A. In 28 games there, he hit a pedestrian .264/.325/.373, and Oakland had apparently seen enough to view him as expendable and send him across the Bay in a rare trade with San Francisco.

While he hit for some power in college, Cox's carrying tool has always been his speed. In 305 minor league games, he has swiped 163 bases and been caught just 29 times. And although he is listed as a utility player, he has played outfield for all but four innings of his minor league career, with most of those coming in center field.

He began 2024 with the Giants' low-A affiliate in San Jose, where he slashed .297/.412/.384 and earned a promotion to high-A Eugene. He struggled there initially, posting a .674 OPS while striking out in 31.9% of his plate appearances, and was forced to repeat the level in 2025. He cut his strikeout rate to 22.4% but failed to replicate the power he had shown in college, homering just 10 times in 597 plate appearances. On FanGraphs' midseason update, he was ranked as the Giants' 37th-best prospect, and did not look like a future big-league regular. Still, he stole 58 bases and showed enough at the plate for the team to assign him to double-A Richmond at the start of the 2026 season.

If this promotion was a sink-or-swim opportunity for Cox, he walked on water. In 44 games with Richmond this year, he has produced a ludicrous .400/.453/.644 slash line with 22 extra-base hits to go along with 27 steals – all while slashing his strikeout rate to 16.9%. It is, to say the least, a stunning turnaround for a player who hit .257 at a lower level a year ago.

How did he do this? While minor league data is limited, the information available suggests Cox has improved his plate discipline in more ways than one. He has produced the lowest swing rate and highest contact rate of his minor-league career (excluding that seven-game complex league stint), suggesting that he has cut down on his chases considerably. What's more, that contact rate has come with greatly improved power numbers, two traits that usually move in opposition.

It is a relatively small sample, and it is still a stretch to expect Cox to access real home run power in the big leagues, but it is not a stretch to think he could be a viable starter even without it. His elite speed enables him to beat out infield hits, as evidenced by his career .369 minor-league BABIP, and take extra bases on balls in the gap. Combine that with his newfound contact skills and ability to play a premium defensive position, and it is easy to imagine him as a big-league regular, though likely not a foundational player.

How Cox can help the 2026 Giants

The Giants were excited to include Jared Oliva on their opening day roster because of his game-changing speed, and Cox fits a similar mold. That said, he is probably not here just to pinch-run and sub in on defense. While those remain his best assets, the 2026 Giants are not just one fast guy away from being good. This team has received anemic offensive production from its outfielders, who have collectively hit .238/.273/.386, and they would not have promoted Cox unless they thought he could help improve that line.

FanGraphs' Eric Longenhagen evaluated Cox as an "average all-around center field defender" last year, but the Giants reportedly view him as the best outfield defender in their system. While those assessments technically aren't mutually exclusive, one cannot help but recall the team's relentless insistence, in the face of a mountain of evidence, that former top prospect Marco Luciano could play shortstop (he could not).

The Luciano comparison is a bit dramatic, as Cox appears to at least have a floor as an average defender, and we will find out soon enough whether he can be even better. Regardless, he figures to see most of his playing time in center field with Casey Schmitt and Jung Hoo Lee presently producing in the corners.

He proved on Sunday against the Colorado Rockies that he's got some wheels as he scored from first on a single and recorded his first big league hit even though it did come against a position player.

Exactly how often he will play remains to be seen, but it is fair to assume he will get some decent run and would not have been called up were that not the expectation for him. Still, the team's handling of Bryce Eldridge suggests they are not afraid to keep a recent call-up on the bench if they feel that's best. At the very least, Cox should start virtually every game against left-handed pitching given that his main competition for playing time, Drew Gilbert, has struggled mightily against southpaws in his career.

At the end of the day, the Giants need help on offense in a bad way, so they are turning to the hottest hitter in their organization. Asking him to maintain even a fraction of his double-A production in the big leagues is a tall order, but the front office seems to think he has a chance to. Or maybe they're just desperate. Either way, they don't have much to lose.

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