Sung-mun Song (born 29 August 1996) is a South Korean professional baseball third baseman for the San Diego Padres of Major League Baseball (MLB). He has played in the KBO League for the Nexen / Kiwoom Heroes from 2015 to 2025 and joined the Padres in 2026.
Career Nexen / Kiwoom Heroes Song debuted for the Nexen Heroes in 2015. He did not become a regular for the Heroes until 2019, and missed the 2020 season and beginning of the 2021 season while fulfilling military service. In 2024, Song was named an All-Star for the first time as well as team captain.
On August 4, 2025, the Heroes signed Song to a six-year contract extension worth ₩12 billion. He requested that the Heroes post him to Major League Baseball after the season.
San Diego Padres On December 22, 2025, Song signed a four-year, $15 million contract with the San Diego Padres of MLB. The team will also pay for an interpreter and roundtrip tickets from South Korea. Song will receive an additional $1 million signing bonus in two installments.
Song began the 2026 season on the injured list due to a strained oblique muscle. He was activated and optioned to the Triple-A El Paso Chihuahuas on April 16. Song made his MLB debut against the Arizona Diamondbacks on April 26 during the MLB Mexico City Series.
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