SF Giants minor league notes: Dayson Croes promotion, Jean Carlos Sio's blistering start

The SF Giants announced a wave of promotions in the minor leagues earlier in the month, but they made one more last week. Dayson Croes moved up to Triple-A while Jean Carlos Sio continued his blistering start in Double-A.

SF Giants minor league notes: Dayson Croes promotion, Jean Carlos Sio's blistering start

1. Dayson Croes promoted to Triple-A

Croes returned to the Sacramento River Cats last week. He finished last season with them but returned to Double-A to start this season. This was likely to spread out the at-bats among middle infielders in the upper minors.

Croes and Nate Furman have similar offensive profiles and limited defensive versatility outside of second base. Furman has performed well in his first turn with the River Cats. He is eligible for the Rule 5 draft in the winter and has the type of skill set that the front office covets in a hitter, so it would not be surprising to see him added to the 40-man roster.

Croes joins a crowded infield mix in Triple-A. He will be vying for at-bats, along with Furman, Aeverson Arteaga, and Osleivis Basabe.

Croes joined the Giants as an undrafted free agent last season. He was preparing for another year in the American Association before he worked out a deal to join the Giants organization. He began the year with a brief stint in the Arizona Complex League and worked his way up to Triple-A by the end of the season.

This year, the left-handed bat hit .264/.315/.372 (84 wRC+) with one home run, 12 RBI, and 17 runs in 131 plate appearances for the Flying Squirrels. This includes a 10.1 percent strikeout rate. Croes has above-average contact skills with a knack for spraying line drives to all fields. He does not hit with much power, so his offensive value will be tied to reaching base and occasional extra-base hits.

2. Jean Carlos Sio's blistering start in Double-A

Jean Carlos Sio has been on a tear since earning a promotion to Double-A earlier this month. Since he is just in his age-22 season, it might be time to take notice. He signed as an international free agent in 2022 out of Cuba.

Since then, the left-handed bat has put up solid numbers, but his performance has taken off over the past two seasons. This is due in large part to a shift in batted-ball events. Sio has flashed a quality hit tool as a pro, but the power numbers have improved quite a bit as he has matured.

Sio is pulling the ball in the air in 17.1 percent of batted-ball events in Double-A, and that is paying dividends. Not surprisingly, this has coincided with a decline in his ground ball rate. He had a 45.5 percent ground ball rate in 2025, but that number is down to 33.0 percent this year. Good things happen when hitters get the ball in the air.

Sio is slashing .300/.340/.640 (149 wRC+) with five home runs, 13 RBI, and eight runs in 53 plate appearances with Richmond. While the power numbers have shown a notable improvement, he is also an aggressive hitter, leading to some strikeouts and a low walk rate.

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