Chen’s MLB career began when the Taiwanese lefty signed a three-year guarantee worth $11.3MM with the Baltimore Orioles before the 2012 season. At that time, he was coming off five seasons starring for the Chunichi Dragons in Japan, where he posted with a 2.48 ERA. He returned to Japan in 2020 with 26 innings of 2.42 ERA baseball for the NPB’s Chiba Lotte Marines.
In between, he made his debut for Baltimore as a 26-year-old in 2012, posting a strong 4.02 ERA/4.42 FIP over 192 2/3 innings. He remained a member of Baltimore’s rotation for four seasons, finishing his tenure there with a 3.72 ERA/4.14 FIP across 117 starts totaling 706 2/3 innings. Those numbers were good for 9.4 bWAR, or 2.6 bWAR per 200 innings. While he was never a frontline starter for the O’s, he put together solid seasons in the middle of the rotation for a contender under manager Buck Showalter.
His four seasons with the Marlins were less efficient. He signed a five-year $80MM contract, but injuries marred his time in Miami. He was released prior to the final season of the deal in 2020. In the four years prior, he amassed a 5.10 ERA/4.54 FIP across 358 innings.