Giants' Prospect Jacob Bresnahan Rises with Dominant Fastball

The 13th-round pick out of high school in 2024 is quickly climbing the minor league ranks.

Mar. 18, 2026 at 2:10am

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Jacob Bresnahan, a left-handed pitcher in the San Francisco Giants' farm system, is quickly emerging as one of the organization's top prospects. After being acquired from the Guardians in a 2024 trade deadline deal, Bresnahan dominated at Class-A San Jose last season, earning California League Pitcher of the Year honors. His rapid rise is fueled by the quality of his fastball, which Giants senior director of player development Kyle Haines says has taken a "massive jump" in terms of velocity, carry, and spin.

Why it matters

The Giants are always on the lookout for promising young pitching talent to bolster their future rotation, and Bresnahan's breakout performance has him firmly on the organization's radar. His continued development could provide the team with a homegrown left-handed starter to complement their existing pitching depth.

The details

Bresnahan, a 13th-round pick out of high school in 2024, was acquired by the Giants in a 2024 trade deadline deal that sent veteran pitcher Alex Cobb to the Guardians. Last season with Class-A San Jose, Bresnahan went 9-3 with a 2.61 ERA, 124 strikeouts, and just 43 walks in 93 innings. He led the California League in ERA, WHIP, and opponent batting average, and his 32.5% strikeout rate was the third-best among left-handed minor leaguers who threw at least 90 innings.

  • Bresnahan was acquired by the Giants in a 2024 trade deadline deal.
  • In 2025, Bresnahan was named the California League Pitcher of the Year.

The players

Jacob Bresnahan

A left-handed pitcher in the San Francisco Giants' farm system who was acquired from the Guardians in a 2024 trade deadline deal. He dominated at Class-A San Jose in 2025, earning California League Pitcher of the Year honors.

Kyle Haines

The San Francisco Giants' senior director of player development, who praised Bresnahan's rapid improvement in fastball quality as a key factor in his rise through the minors.

Alex Cobb

The veteran pitcher who was traded by the Giants to the Guardians in the deal that brought Bresnahan to San Francisco.

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What they’re saying

“Jacob's fastball quality took a massive jump. His velocity is good and the pitch characteristics of his fastball are great, with the carry and spin effect. His kick change has such low spin it acts like a splitter and it's so devastating. The next big step is improving his slider.”

— Kyle Haines, Giants senior director of player development (MLB.com)

What’s next

Bresnahan is likely to start the 2026 season at either High-A Eugene or Double-A Richmond, as he continues his climb towards the major leagues.

The takeaway

Bresnahan's rapid rise through the Giants' farm system, fueled by his dominant fastball, has him positioned as one of the organization's top pitching prospects. His continued development could provide the Giants with a promising left-handed starter to complement their existing pitching depth in the coming years.