Seth Lonsway

Seth Lonsway
San Francisco Giants
Pitcher
Born: (1998-10-07) October 7, 1998 (age 28)
St. Marys, Ohio, U.S.
Bats: Left
Throws: Left
MLB debut
August 29, 2026, for the San Francisco Giants
MLB statistics
(through 2026 season)
Win–loss record0–0
Earned run average7.71
Strikeouts2
Stats at Baseball Reference Edit this at Wikidata
Teams

Seth Joseph Lonsway (born October 7, 1998) is an American professional baseball pitcher in the San Francisco Giants organization. He made his Major League Baseball (MLB) debut in 2026.

Amateur career

Lonsway attended Celina High School in Celina, Ohio, and played college baseball at Ohio State University. Following his high school graduation, he was selected by the Cincinnati Reds in the 19th round of the 2017 MLB draft but declined to sign. In 2019, he played collegiate summer baseball with the Brewster Whitecaps of the Cape Cod Baseball League. As a redshirt junior at Ohio State, Lonsway posted a 4.37 earned run average (ERA) with 98 strikeouts in 12 starts.

Professional career

The San Francisco Giants selected Lonsway in the sixth round, with the 176th overall selection, of the 2021 Major League Baseball draft. He made his professional debut that year with the Arizona Complex League Giants. Lonsway spent the 2022 season with the Single-A San Jose Giants recording a 4.06 ERA with 120 strikeouts in 26 appearances. In 2023, he made 28 appearances for the High-A Eugene Emeralds, pitching to a 5.87 ERA with 78 strikeouts. Following the season, Lonsway played for the Scottsdale Scorpions of the Arizona Fall League. He returned to Eugene to begin the 2024 season before earning a promotion to the Double-A Richmond Flying Squirrels. Across the two levels, he recorded a 3.01 ERA with 83 strikeouts. Lonsway spent the 2025 season with Richmond and the Triple-A Sacramento River Cats, pitching to a 3.76 ERA with 122 strikeouts.

Lonsway began the 2026 season with Triple-A Sacramento and also pitched for Double-A Richmond, posting a 5.95 ERA between the two affiliates. On August 29, 2026, the Giants selected his contract and promoted him to the major leagues for the first time. He made his debut that day against the Arizona Diamondbacks, pitching two innings as part of the 7–1 loss. Following the game, Lonsway was optioned back to Triple-A. On November 2, Lonsway was removed from the 40–man roster and sent outright to Triple–A Sacramento.

References

  1. ↑ "MLB Draft: Celina grad, top Ohio State recruit taken by Reds in MLB draft". DaytonDailyNews.com. June 14, 2017. Retrieved August 29, 2026.
  2. ↑ "Reds draft Celina grad Lonsway". LimaOhio.com. June 15, 2017. Retrieved August 29, 2026.
  3. ↑ "2019 Brewster Whitecaps". thebaseballcube.com. Retrieved August 31, 2026.
  4. ↑ "Taking a Giant step". The Daily Standard. Retrieved August 29, 2026.
  5. ↑ Schmidt, Lori. "San Francisco Giants select Ohio State's Seth Lonsway in MLB Draft". The Columbus Dispatch. Retrieved August 29, 2026.
  6. ↑ Fulks, Sonny (February 7, 2024). "Where Are They Now?... Former Buckeye Seth Lonsway Prepares For Another Step". Press Pros Magazine. Retrieved August 29, 2026.
  7. ↑ "Lonsway Promoted To AAA Sacramento". Stateline Sports Network. July 30, 2025. Retrieved August 29, 2026.
  8. ↑ "Giants' Seth Lonsway: Contract selected". CBS Sports. August 29, 2026. Retrieved August 29, 2026.
  9. ↑ Rodriguez, Tristin (August 29, 2026). "What we learned as Giants waste Matt Wilkinson's solid Oracle Park debut in loss". NBC Sports Bay Area.
  10. ↑ Byrne, Connor (August 29, 2026). "Giants Select Yunior Marte For MLB Debut". mlbtraderumors.com.
  11. ↑ McDonald, Darragh (November 2, 2026). "Giants Release Tristan Beck; Outright Joel Kuhnel, Seth Lonsway". MLB Trade Rumors. Retrieved November 2, 2026.