Ryan Zeferjahn

Ryan Joseph Zeferjahn (born February 28, 1998) is an American professional baseball pitcher for the Los Angeles Angels of Major League Baseball (MLB).

Ryan Zeferjahn
Zeferjahn pitching in the Florida Complex League in 2021
Los Angeles Angels – No. 56
Pitcher
Born: (1998-02-28) February 28, 1998 (age 27) Topeka, Kansas, U.S.
Bats: Right Throws: Right
MLB debut
August 25, 2024, for the Los Angeles Angels
MLB statistics (through July 18, 2025)
Win–loss record	5–3
Earned run average	4.58
Strikeouts	61
Teams
Los Angeles Angels (2024–present)

Amateur career

A native of Topeka, Kansas, Zeferjahn played college baseball at the University of Kansas.^[1] In 2017, he played collegiate summer baseball with the Falmouth Commodores of the Cape Cod Baseball League.^[2]

Professional career

Boston Red Sox

Zeferjahn was drafted by the Boston Red Sox in the third round, with the 107th overall selection, of the 2019 Major League Baseball draft.^[3][4] He made his professional debut with the Low–A Lowell Spinners, logging a 4.50 ERA in 12 starts. Zeferjahn did not play in a game in 2020 due to the cancellation of the minor league season because of the COVID-19 pandemic.^[5]

Zeferjahn returned to action in 2021 with the rookie–level Florida Complex League Red Sox and Single–A Salem Red Sox. In 16 starts between the two affiliates, he compiled a 1–4 record and 5.98 ERA with 59 strikeouts across 55+2⁄3 innings pitched.^[6] Zeferjahn split the 2022 campaign between the High–A Greenville Drive and Double–A Portland Sea Dogs. In 34 appearances pitching mainly in relief, he accumulated a 5–4 record and 5.05 ERA with 80 strikeouts over 71+1⁄3 innings pitched.^[7]

Zeferjahn spent 2023 with Portland, also making two scoreless outings for Salem. In 34 appearances out of the bullpen for Portland, he recorded a 5.02 ERA with 68 strikeouts across 43 innings of work.^[8] Zeferjahn began the 2024 season with Portland, and was promoted to the Triple–A Worcester Red Sox after seven scoreless appearances. In 18 games for Worcester, he registered a 5.47 ERA with 31 strikeouts and 4 saves over 24+2⁄3 innings.^[9]

Los Angeles Angels

On July 30, 2024, Zeferjahn, Matthew Lugo, Yeferson Vargas, and Niko Kavadas were traded to the Los Angeles Angels in exchange for Luis García.^[10] In 5 games for the Triple–A Salt Lake Bees, he posted a 2.35 ERA with 8 strikeouts. On August 23, Zeferjahn was selected to the 40-man roster and promoted to the major leagues for the first time.^[11] In 12 appearances for Los Angeles during his rookie campaign, Zeferjahn recorded a 2.12 ERA with 18 strikeouts over 17 innings of work.

On April 6, 2025, Zeferjahn recorded his first career win after tossing a scoreless sixth inning against the Cleveland Guardians.^[12]