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Can Sinclair become a late-inning go-to for Nats?

In 2025, right-hander Jack Sinclair was invited to Nationals Major League Spring Training. He began the season in Triple-A Rochester, but was sent down to Double-A Harrisburg that July for the remainder of the year. This year, Sinclair was not…

MLB Official

Published: Wednesday, 7 October 2026 at 1:50 PM

Key Things to Know

Jack Sinclair emerged as a reliable late-inning bullpen option for the Washington Nationals in September.
Sinclair made his MLB debut on Sept. 4, posting a 2.45 ERA and one save across 11 games.
Manager Blake Butera praised Sinclair for handling high-leverage situations and pitching without fear.

The Story in 60 Seconds

Washington Nationals right-handed reliever Jack Sinclair made a strong impression in September after making his Major League debut on Sept. 4. The 27-year-old posted a 1-0 record with a 2.45 ERA and one save over 11 appearances. Manager Blake Butera praised Sinclair for his poise and reliability in high-leverage late-inning situations.

Sinclair held right-handed batters to a .048 batting average during his September stint, relying primarily on a sweeper and a fastball averaging 96.9 mph. Heading into the offseason, Sinclair plans to build strength and increase his velocity as the Nationals look ahead to 2027.

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Can Sinclair become a late-inning go-to for Nats?

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