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Ever since the current regime took over control, after the 2016 season, we have seen a drastic philosophical shift in how the Twins approach pitching. This includes everything from the pitchers that they target to bring into the organization, to their coaching methods to get try and maximize the ceilings of each of their pitchers. This has paid off huge dividends, as in a few short years they have transformed the Twins pitching staff from perennial bottom dwellers to one of the best pitching staffs in baseball.
One of their great abilities has been their ability to take players who were once thought of as a lost cause and turn them into viable weapons in the bullpen. Last year, we saw this work exhibited with failed starter turned shut down reliever Tyler Duffey. As you may recall, Duffey was not even on the Twins 25-man roster to begin 2019, and by then end of the season he was one of their most trusted relievers. The main reason for this turn around came from a revamped approach to Duffey’s game. This year, they dug even deeper into the well and pulled out Caleb Thielbar and Matt Wisler and helped transform them into new and improved relievers that the Twins should be able to count on for outs in October.
We saw this growing faith in both Thielbar and Wisler on full display in Tuesday night’s win over the Chicago White Sox, when they were called upon in the seventh and ninth innings to help close out the one run victory, putting an end to the Twins six-game losing streak. While neither is among the first choices for Rocco Baldelli out of the pen at this point, Thielbar and Wisler have still shown that when called upon, they can get the job done.
Outside of Twins fans, Caleb Thielbar is a name that most baseball fans have probably never heard of, or don’t remember. After his initial stint with the Twins ended in 2015, Thielbar spent two seasons pitching for the St. Paul Saints in 2016 and 2017. This led to another shot in affiliated ball, as the Detroit Tigers signed him and sent him to Double-A Erie. He spent the next three years in both the Tigers and Braves organizations before finally making his way back up to the major league level with the Twins this season.
Throughout his career, Thielbar has never been much of a strikeout pitcher. In his first stint with the Twins, from 2013 through 2015, Thielbar had a strikeout rate of just 19.9%. During his next few years in the minors, that remained the case for Thielbar. However, everything changed for him in June of 2018, when he was sent back down to Double-A Erie after starting the season in Triple-A Toledo. Up to that point in the season, Thielbar had struck out just 9 batters in 17 innings pitched. After that point, though, Thielbar ramped it up, as he struck out 42 batters over his last 40 innings of the season. He continued that trend into 2019, where he struck out 94 batters in 78 and 1/3 innings pitched.
For the Twins, it was clear that Thielbar was a new and improved pitcher, even though nobody else saw it. Unfortunately, we do not have public access to the same tracking information for minor league players that we do for major league players, so it is hard to know exactly what led to this drastic improvement in Thielbar’s strikeout ability, but if I had to take a guess based on the limited amount of data we have on him so far this year, it is his pitch movement that has been giving hitters trouble. Here is a tweet from Jeremy Maschino that does a great job of illustrating this.
https://twitter.com/JMaschino_56/status/1298654638057623552
After giving up two runs in his first outing, both coming in the third inning of that appearance, Thielbar has thrown 8 and 1/3 scoreless innings, across 8 appearances. Over that stretch, Thielbar has struck out 12 batters, while allowing an opposing OPS of .315. Note, that is not an opposing OBP of .315, but an opposing OPS of .315. While it is still a small sample size, this is a side of him we never saw before, and based on his performance in the minors the last couple years, it is clear that this really is a new and improved Caleb Thielbar.
Matt Wisler, on the other hand, was a case of a new approach in 2019 that taken for face value was a failed experiment. Wisler had been slowing working on expanding his slider usage ever since he first moved to the bullpen in 2017. Last year, he went all-in on this approach, as he spiked the usage of his slider up from 47.0% in 2018 to 70.5% in 2019. The results were not that appealing, as his ERA in 2019 was 5.61, causing both the San Diego Padres and Seattle Mariners to all but give up on him.
However, the Twins didn’t see this as a failed experiment, but rather one with incomplete results. This led them to take a low risk flyer on Wisler, where they have encouraged him to go even further, as Wisler has increased his slider usage all the way up to 81.3% so far this year.
So, what was it that the Twins saw that led them to this hypothesis, and thus take a flyer on Wisler? The first thing was the small sample size of just 51 and 1/3 innings pitched by Wisler in 2019. In addition to that, nearly all of the underlying metrics were saying that Wisler was a much better pitcher in 2019 than his 5.61 ERA suggested. His FIP and xFIP stood at 4.17 and 3.83, respectively. Wisler drastically increased his strikeout rate from his career average of 16.4% up to 28.1%, while at the same time decreasing his walk rate from his career average of 8.5% down to 7.1%.
The Statcast metrics also like what Wisler was doing, as he produced career lows in Hard Hit Rate (34.5%), Barrel Rate (6.2%), xwOBA (.301) and xERA (3.84). For reference, Wisler’s xwOBA of .301 ranked 108th of the 362 qualified pitchers in 2019. Those are all very good numbers for a guy that nobody seemed to want this offseason. Relying on these advanced metrics, as opposed to the more traditional metrics, has paid off big for the Twins, as Wisler has allowed just two runs in the 16 and 2/3 innings he has pitched so far this season.
While neither Wisler nor Thielbar should expect to be featured heavily in the backend of the Twins bullpen before the end of the season, baring injury, both pitchers should absolutely expect to be in contention for a spot on the Twins Postseason roster, and look to help give them big outs in the stretch run of the season.
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