Giants pitching prospect set to make MLB debut vs. Pirates

Giants pitching prospect Carson Whisenhunt will make his Major League debut on Monday as San Francisco’s scheduled starter against the Pirates.  The move seemed to be in the cards since Whisenhunt was scratched from a planned Triple-A start on Saturday, and he arrived in the Oracle Park clubhouse today as a member of the Giants’ taxi squad.  The corresponding transaction(s) will be announced tomorrow to add the left-hander to both the active roster and the 40-man roster.

Manager Bob Melvin officially confirmed the call-up when speaking with reporters (including Justice delos Santos of the San Jose Mercury News) after tonight’s 5-3 loss to the Mets.  “We’ve been waiting for this for a little bit now,” Melvin said.  “We thought maybe he’d be here last year, too.  He’s our top pitching prospect, I believe.  With what’s going on with the injury and [Hayden Birdsong] going down, there’s a need for it.”

Birdsong was optioned to the minors earlier this week, and Landen Roupp was placed on the 15-day injured list on Friday due to right elbow inflammation.  This dropped the Giants’ rotation down to just Logan Webb, Robbie Ray, and Justin Verlander, and the club had to deploy a bullpen game for tonight’s contest with New York.  The loss was the Giants’ ninth in their last 11 games, and the 54-52 team is now three games back of the Padres for the final NL wild card berth.

Starting pitching is a target area for the Giants as the deadline approaches, but getting some quality results from Whisenhunt at the beginning of his MLB career would be an enormous help for the club.  A second-round pick for San Francisco in the 2022 draft, Whisenhunt was garnering top-100 attention prior to a 2024 season that saw him post a 5.42 ERA over 104 2/3 innings at Triple-A Sacramento.  Whisenhunt hasn’t been a ton better this year, with a 4.42 ERA in 97 2/3 IP.  While the southpaw has reduced his ERA and walk rate, his strikeout rate has also dropped from 28.4% in 2024 to 21% this year.

Pitching in the hitter-friendly Pacific Coast League could very well be a factor in Whisenhunt’s struggles, yet he’ll face additional challenges by moving up to face big league hitters.  Whisenhunt’s signature pitch is a 70-grade changeup that has drawn raves from evaluators, and his 92-94mph fastball is considered a plus pitch with enough sink to overcome somewhat average velocity.  That fastball is a little inconsistent, however, which is an issue since the lefty doesn’t have a reliable third pitch in his arsenal.  The development of Whisenhunt’s slider could be the determining factor whether or not he can stick as a starting pitcher or if a move to the bullpen could be in his MLB future.

As much as San Francisco’s lack of offense has been the team’s biggest obstacle, the lack of reliable rotation depth behind Webb and Ray is another issue for the playoff push.  Adding a veteran arm to support the big two starters would help at the deadline, and is perhaps a more readily fixable problem given how the Giants may not need to add bats as much as they need several of their slumping hitters to get rolling.  There’s plenty of opportunity here for Whisenhunt to carve out a niche for himself in the rotation and set himself up for a starting job heading into next season.