Jonah Cox has given the SF Giants plenty to like in his rookie season, but one number keeps hanging over everything else: the strikeouts.
The tools are obvious. Cox can cover ground in center field, has also logged some time at second base lately, and brings real value as a base stealer.
Even when he doesn’t reach base with a hit, he still finds ways to matter. His speed changes how defenses play him, and it can turn ordinary-looking balls in play into uncomfortable moments for the other side.
That quickness has already shown up in the form of pressure on the defense and occasional mistakes forced along the way. When Cox is running, the infield has to move faster, think faster, and make cleaner decisions.
But the contact issues are the wrinkle.
Through 161 plate appearances, Cox is slashing .259/.307/.392 with four home runs, 16 RBI, and 25 runs. That line comes with a 96 wRC+, but it also includes an alarming 38.5 percent strikeout rate.
The Giants have seen rookies work through swing-and-miss problems before, and Cox is not the first to deal with that kind of learning curve. Aaron Judge struck out more than 40 percent of the time as a rookie in 2016, and while that rate has come down, he still whiffs at a high clip despite becoming one of the best right-handed hitters in baseball history.
Cox’s issue does not appear to be passivity. He is aggressive, whether the pitch is in the zone or not.
The problem is that he is not making enough contact when he does swing at strikes. His 71.4 percent zone contact rate is among the lowest in baseball, and only Munetaka Murakami (70.4 percent zone contact) of the Chicago White Sox is lower among hitters with at least 150 plate appearances.
That kind of number usually tells the story pretty clearly: too many empty swings in the zone, too many strikeouts, too little put in play.
It’s a concern because it points to bat-to-ball problems across the board, not just on one pitch type. Cox has had trouble making contact against all kinds of offerings, which fits the profile his strikeout rate already suggests.
There is room for growth here, but the Giants need that growth to come quickly. The target is straightforward: get the strikeout rate below 30 percent.
Cox also owns a .429 BABIP, a mark that is probably headed back to earth, but it does show that when he does connect, good things have happened. For 2027, the Giants will want much more of that version of him.
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