On Saturday August 30, 2025, the new No. 5 starter in the San Francisco Giants pitching rotation will make his first MLB start: right-handed pitcher Carson Seymour.
Seymour, 26, and the Giants will take on the Baltimore Orioles in the second game of a three game series at 4:15 PM, with the game airing nationally on FOX.
Seymour is in the midst of a solid rookie season for San Francisco, but has pitched entirely out of the bullpen in the big leagues. In 10 MLB games, he has thrown 21.2 innings and registered a 3.74 ERA.
However, Seymour has been a starting pitcher throughout his minor league career. In 16 games (15 starts) for the AAA Sacramento River Cats this season, Seymour has a 3.86 ERA and 90 strikeouts in 77 innings.
Seymour throws hard, and scouts consider his best pitch to be his sinker, which he can throw at up to 97 miles per hour.
How Long Can Seymour Pitch on Saturday?
Since this is Seymour’s first foray into the Giants rotation after spending significant time in the bullpen, fans shouldn’t expect his start to be very long.
That’s not because Seymour is going to struggle necessarily, or anything like that. It’s just because Seymour has had the routine of a bullpen pitcher since late June.
Seymour also pitched an inning just three days ago, shorter than the standard four days rest for starting pitchers.
But it’s not like Seymour will function as the “opener” or anything like that either, just throwing one inning. This is not a true bullpen game for the Giants. Seymour has been throwing over 2.1 innings per outing in the big leagues, in a long relief role.
The Giants tabbed Seymour to throw because they believe he can give them the closest thing to a real MLB start.
Expect Seymour to throw four innings, maybe five if he has an extremely dominant and efficient start.
The State Of The Giants Rotation
The Giants have been without a No. 5 starter since they demoted Kai-Wei Teng to AAA Sacramento on August 21, 2025.
They have cycled through numerous young pitchers to fill in their rotation spots behind aces Robbie Ray and Logan Webb. Justin Verlander has been mostly healthy and serviceable and before his season-ending injury, Landen Roupp emerged as a rotation mainstay.
But the Giants haven’t landed on a consistent No. 5 option all season. Wei-Teng, Carson Whisenhunt, Hayden Birdsong, Jordan Hicks, and Kyle Harrison have all gotten their shot before being demoted to AAA or traded.
The Giants don’t have much organizational starting pitching depth. So Seymour has a huge opportunity to establish himself in the Giants’ future starting rotation plans.
Roupp will be back healthy next season, but Verlander will likely be gone. So both Carsons, Seymour and Whisenhunt, could gain an inside track to the Giants rotation if they pitch well to finish the season.
But of course, the Giants could consider other minor leaguers or sign a free agent starter if they don’t pan out. So the pressure is on down the home stretch of the season.
Giants fans, are you excited to see Carson Seymour get a shot at cracking the Giants rotation?
Like Heavy Sports’s content? Be sure to follow us.
This article was originally published on Heavy Sports
The post San Francisco Giants Add New Player To Starting Pitching Rotation appeared first on Heavy Sports.