Now 24 years of age, Tseng originally signed with the Cubs out of Taiwan in 2013. He has produced good results at times in the minors, but the club obviously did not feel he was likely to provide much at the game’s highest level.
After a strong 2017 showing in the upper minors, Tseng was knocked around last year for a 6.27 ERA in 136 1/3 Triple-A innings. Tseng did manage a reasonably promising combination of 7.6 K/9, 2.9 BB/9, and a 48.4% groundball rate, and was likely unfortunate to carry only a 59.2% strand rate, but he was also touched for twenty long balls.
Tseng only has eight MLB frames under his belt, over which he has compiled an impressive 11:2 K/BB ratio. But he has also surrendered three home runs and eight earned runs in that brief span. Tseng struggled badly in limited Cactus League action this spring.