Red Sox Prospect Payton Tolle's 'Unicorn Fastball' and Garrett Whitlock's Changeup

Tolle aims to master Whitlock's signature pitch, but faces challenges in replicating its unique movement.

Apr. 12, 2026 at 8:38am

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A fragmented, geometric painting depicting a baseball pitcher's motion, with the ball as the central focus, rendered in a vibrant color palette that captures the energy and dynamism of the pitch.A cubist interpretation of a Red Sox pitcher's explosive delivery, highlighting the raw power and precision of their 'unicorn fastball'.Boston Today

Payton Tolle, the top pitching prospect for the Boston Red Sox, has a four-seam fastball that has been dubbed a 'unicorn fastball' by his teammates. However, Tolle has struggled to develop his secondary pitches, leading the Red Sox to move him to the bullpen. Tolle is now focused on mastering Garrett Whitlock's signature changeup, which he describes as running more than any other pitch in the league. Despite the difficulty in replicating Whitlock's grip and movement, Tolle remains determined to add the pitch to his arsenal.

Why it matters

The development of Tolle's pitching repertoire is crucial for the Red Sox, as they aim to integrate their top prospect into the major league roster. Tolle's 'unicorn fastball' has generated buzz, but the team wants him to diversify his pitch mix to become a more well-rounded and effective pitcher. Whitlock's changeup has become a benchmark for pitchers around the league, and Tolle's pursuit of mastering it could help him take the next step in his career.

The details

Tolle, 23, made his major league debut last August, relying heavily on his four-seam fastball, which accounted for 64.1% of his total pitch mix. While his debut was impressive, the Red Sox felt Tolle's secondary pitches needed more development, leading them to move him to the bullpen. Tolle has now set his sights on mastering Whitlock's signature changeup, which he describes as running more than any other pitch in the league. However, Tolle has struggled to replicate the unique grip and movement of Whitlock's changeup, resulting in a 2-for-3 performance for opposing batters.

  • Tolle made his major league debut in August 2025.
  • Tolle was moved to the bullpen after his first two starts in the majors.

The players

Payton Tolle

The Boston Red Sox's top pitching prospect, known for his 'unicorn fastball' that has generated buzz among his teammates.

Garrett Whitlock

A veteran pitcher for the Boston Red Sox, known for his unique and effective changeup that has become a benchmark for pitchers around the league.

Alex Cora

The manager of the Boston Red Sox, who has acknowledged the need for Tolle to develop his secondary pitches.

Craig Breslow

The chief baseball officer for the Boston Red Sox, who has also commented on the need for Tolle to improve his pitch mix.

Matt Andriese

A veteran arm in the Boston Red Sox bullpen during Whitlock's rookie season, who Tolle has credited for helping him develop his pitches.

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What they’re saying

“His secondary stuff was good. Just gotta keep getting better.”

— Alex Cora, Manager, Boston Red Sox

“To say I failed miserably might be an understatement.”

— Payton Tolle

“I told him, 'Nobody else is gonna be able – if somebody else could throw that changeup, good for them, but not me.'”

— Payton Tolle

“It's all about what your arsenal is, does it play well with your arsenal, and that's how I go about it.”

— Garrett Whitlock

“We know Tolle's got a unicorn fastball. The biggest thing is exploiting that and making sure that every other pitch tunnels off that.”

— Garrett Whitlock

What’s next

Tolle will continue to work on developing his secondary pitches, with a focus on mastering Whitlock's changeup, as he aims to earn a permanent spot in the Red Sox's starting rotation.

The takeaway

Tolle's 'unicorn fastball' has generated significant buzz, but the Red Sox recognize the need for him to diversify his pitch mix to become a more well-rounded and effective pitcher at the major league level. Whitlock's changeup has become a benchmark for pitchers around the league, and Tolle's pursuit of mastering it could be a crucial step in his development as a top prospect.