SF Giants minor league notes: Argenis Cayama's walk rate, Jonah Cox's speedy start

The SF Giants minor league affiliates are all off to strong starts in 2026. Argenis Cayama has anchored the San Jose Giants' rotation, whereas Jonah Cox has helped support a surprisingly strong lineup with the Richmond Flying Squirrels.

SF Giants minor league notes: Argenis Cayama's walk rate, Jonah Cox's speedy start

1. Argenis Cayama's walk rate

Argenis Cayama was one of the many young Giants pitching prospects to pop up last summer. He posted a 2.25 ERA in 12 starts for the Arizona Complex League Giants before finishing the year with San Jose.

In his return to the California League, the 19-year-old pitcher has been excellent through three starts. He has recorded a 3.55 ERA with 16 strikeouts against zero walks in 12.2 frames. Yes, he has not allowed a walk yet this year.

Cayama has a better feel for pitching than many prospects his age. His arsenal includes a mid 90's fastball with a low 80's slider and a mid 80's changeup. His two-seamer has heavy, sinking action that leads to a lot of ground balls. He relies a lot on his slider to steal strikes in and out of the zone, while the changeup has shown some promise.

More than anything, Cayama has an easy, repeatable delivery with a three-quarters arm slot that helps him land his pitches in the zone.

2. Jonah Cox's speedy start

Over the years, Richmond's roster has often been light on talent. However, this year's club is off to a surprisingly strong 12-2 start.

There are several players who have played a big role in that. This includes Turner Hill, who has already received a promotion to Triple-A.

Jonah Cox has arguably been Richmond's best player so far. He is hitting .429/.500/.619 (193 wRC+) with one home run, 11 RBI, and seven runs in 50 plate appearances this season.

How Cox is hitting the ball has not changed much, but his pull rate is sitting at nearly 50 percent. That has led to a notable increase in his slugging percentage compared to prior years.

In addition to getting off to a good start in the batter's box, Cox has some major league tools that he brings to the table. This includes above-average and functional speed, as he has swiped 58 bags in each of the past two seasons. Plus, he is a good defender in the outfield. Cox adds to this by playing with a lot of energy.

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