Jon Duplantier


Jon Christopher Duplantier is an American professional baseball pitcher for the Yokohama DeNA BayStars of Nippon Professional Baseball. He has previously played in Major League Baseball for the Arizona Diamondbacks, and in NPB for the Hanshin Tigers. The Diamondbacks selected Duplantier in the third round of the 2016 MLB draft.
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Career

Amateur career

Duplantier attended Seven Lakes High School in Katy, Texas, and Rice University. He played college baseball for the Rice Owls. After missing the 2015 season due to a shoulder injury, Duplantier returned in 2016, and was named the Conference USA Pitcher of the Year.

Arizona Diamondbacks

The Arizona Diamondbacks selected Duplantier in the third round of the 2016 Major League Baseball draft. He made his professional debut with the Hillsboro Hops in June 2016, and pitched one inning there, striking out the side. He started 2017 with the Kane County Cougars and was later promoted to the Visalia Rawhide, posting a combined 12–3 record with a 1.39 ERA in 25 games, including 24 starts between both teams. He played in the 2017 All-Star Futures Game. MLB Pipeline named him their Pipeline Pitcher of the Year.
Duplantier spent the 2018 season pitching for the Jackson Generals. In 14 starts, he went 5–1 with a 2.55 ERA.
On April 1, 2019, Duplantier was called up to the major leagues for the first time, and made his major league debut. He recorded three scoreless innings in relief and earned a save. He finished the season with a 1–1 record in 15 games. Duplantier did not appear in a game with Arizona in 2020 and did not play in a minor league game due to the cancellation of the minor league season because of the COVID-19 pandemic.
Duplantier was assigned to the Triple-A Reno Aces to begin the 2021 season. He struggled to a 7.78 ERA in four games between Reno and the rookie-level Arizona League Diamondbacks, and fared worse in the majors, struggling to a 13.15 ERA with 12 strikeouts in 13 innings over four appearances. While pitching in the minor leagues, Duplantier suffered a season-ending lat strain. Since injured players cannot be placed on outright waivers, the Diamondbacks released Duplantier on July 27, 2021.
On July 31, the Diamondbacks re-signed Duplantier to a minor league contract. He elected minor league free agency following the season.

Los Angeles Dodgers

On December 4, 2021, the San Francisco Giants signed Duplianter to minor league contract. On December 8, the Los Angeles Dodgers selected Duplantier from the Giants in the minor league phase of the Rule 5 draft. He appeared in 34 games for the Triple-A Oklahoma City Dodgers during the 2022 season, with a 5–3 record and 4.80 ERA. Duplantier elected free agency following the season on November 10, 2022.

Philadelphia Phillies

On January 6, 2023, Duplantier signed a minor league contract with the Philadelphia Phillies organization. He made 3 starts for their Class-A Advanced affiliate, registering an 8.38 ERA with 12 strikeouts in innings pitched. On June 17, Duplantier was released by the Phillies.

New York Mets

On February 29, 2024, Duplantier signed a minor league contract with the New York Mets. In 16 games for the Triple–A Syracuse Mets, he posted a 5.31 ERA with 22 strikeouts across innings pitched. On June 13, Duplantier was released by the Mets organization.

Lake Country DockHounds

On July 11, 2024, Duplantier signed with the Lake Country DockHounds of the American Association of Professional Baseball. He made four starts for them, pitching 18 innings without allowing an earned run.

Los Angeles Dodgers (second stint)

On August 5, 2024, Duplantier signed a minor league contract with the Los Angeles Dodgers. He made one start for the Double–A Tulsa Drillers and six for the Triple–A Oklahoma City Baseball Club, where he had a 3–2 record and 3.56 ERA in innings. In his final start of the season, against the Salt Lake Bees, on September 18, Duplantier struck out a career–high 12 batters in six perfect innings. He elected free agency following the season on November 4.

Hanshin Tigers

On November 25, 2024, Duplantier signed a minor league contract with the Milwaukee Brewers. He was released by the organization on December 16 and signed with the Hanshin Tigers of Nippon Professional Baseball the same day. Duplantier made 15 appearances for Hanshin in 2025, compiling a 6-3 record and 1.39 ERA with 113 strikeouts across innings pitched. On December 2, 2025, Duplantier and the Tigers parted ways.

Yokohama DeNA BayStars

On December 16, 2025, despite previous reports that he had agreed to a deal with the Fukuoka SoftBank Hawks, Duplantier elected to sign with the Yokohama DeNA BayStars of Nippon Professional Baseball.