All of Thielbar’s MLB experience came in Minnesota between 2013 and 2015. He carried a 2.74 ERA in 98 2/3 innings, in fact. He only carried a 79:30 K/BB ratio but had success at tamping down the long ball and batting average on balls in play.
Since Thielbar’s chances fizzled out with the Twins and he never got another shot elsewhere, it seems there’s quite a lot of doubt as to whether he can really succeed over the long haul in the majors. He ended up spending two years on the indy ball circuit and hasn’t seen the bigs since. But he has been awfully stingy in the upper minors in the past two seasons. Last year, he ran up a 3.22 ERA with an eyebrow-raising 94:16 K/BB ratio over 78 1/3 innings in 51 appearances in the hitter-friendly International League.