Seth Halvorsen

Seth Michael Halvorsen (born February 18, 2000) is an American professional baseball pitcher for the Los Angeles Dodgers of Major League Baseball (MLB). He has previously played in MLB for the Colorado Rockies, with whom he debuted in 2024.

Amateur career Halvorsen grew up in Plymouth, Minnesota and attended Heritage Christian Academy in Maple Grove, Minnesota. He was the Minnesota Gatorade Player of the Year and a Rawlings high school All-American in 2018. He was selected in the 30th round of the 2018 MLB draft by the Minnesota Twins but did not sign.

Halvorsen enrolled at the University of Missouri, where he played college baseball for the Missouri Tigers. After appearing in 4 games in 2019, he was shut down and had Tommy John surgery. He returned in 2020 as a center fielder, playing in 14 games. In summer 2020, he played for the Great Lakes Resorters, a temporary Covid-19 pod team in the Northwoods League based in Traverse City, Michigan.

Halvorsen resumed pitching in 2021 and led the Tigers with 4 wins, 70 strikeouts, and 72 innings pitched. He did not sign. He played collegiate summer baseball with the Hyannis Harbor Hawks of the Cape Cod Baseball League.

Halvorsen then transferred to play for the Tennessee Volunteers but missed all of 2022 after fracturing his elbow. He returned as a reliever in 2023, going 3–3 with 2 saves, a 3.81 ERA and 52 strikeouts in 52 innings. He split his first professional season between the rookie-level Arizona Complex League Rockies, High+A Spokane Indians, and Double-A Hartford Yard Goats. In 13 appearances for the three affiliates, he had a 2–0 record, 2.70 ERA, and 13 strikeouts across innings pitched.

Halvorsen began the 2024 season in Double-A and earned a promotion to the Triple-A Albuquerque Isotopes in early August. In 41 minor league appearances out of the bullpen, he had a 5–2 record, 4.47 ERA, and 56 strikeouts in innings pitched.

On August 30, Halvorsen was added to the 40-man roster and promoted to the major leagues for the first time. He earned his first win on September 12 against the Detroit Tigers. He ended his first MLB season with a 2–1 record, two saves, and a 1.46 ERA. He was 1–2 with 11 saves in 42 games in his rookie season with Colorado. His season ended in early August after he went on the injured list with a right elbow strain.

Halvorsen was optioned to Triple-A Albuquerque to begin the 2026 season.

Los Angeles Dodgers On July 20, 2026, Halvorsen was traded to the Los Angeles Dodgers in exchange for Nick Frasso and Landyn Vidourek.

Personal life Halvorsen has three siblings. He graduated from the University of Tennessee with a bachelor's degree in hospitality and tourism management in 2023.