Jon Duplantier Signs With NPB’s Yokohama BayStars

The Yokohama DeNA BayStars of Japan’s Nippon Professional Baseball announced the signing of right-hander Jon Duplantier. The 31-year-old will remain in Japan for a second season after spending the ’25 campaign with the Hanshin Tigers.

A former highly-regarded prospect with the Diamondbacks, Duplantier was set back by injuries. He wound up making just 19 appearances between 2019-21. A lat strain led Arizona to drop him from the 40-man roster midway through the 2021 season. The Rice product subsequently bounced around on minor league contracts with Arizona, San Francisco, Philadelphia, the Mets, Dodgers and Milwaukee without getting to the majors. The Brewers granted him his release to pursue an NPB opportunity last year.

Duplantier’s first season in Japan could hardly have gone better from a performance perspective. He struck out 32.4% of opponents against a 5.7% walk rate while working to a 1.39 earned run average. Health was again the caveat, as he was limited to 15 starts and 90 2/3 innings by a lower body injury. His numbers were impressive enough that there was some thought he could return stateside. He evidently found a superior offer to join a new NPB club instead. If he can put together a full season at anywhere near his ’25 level of production, he should be in position to command a big league contract next offseason.