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Caleb Thielbar just had his best career season in the Major Leagues. If you were unfamiliar with Thielbar's journey to the Big Leagues, you may think he would be a failed starter that figured things out in the bullpen or perhaps a young pitcher with a live arm that learned how to get MLB hitters out. However, as Twins fans, we know he is neither. Caleb Thielbar pitched 2022 as a 35-year-old that should have been seeing the twilight of his career in view but instead had his best season and made several improvements. You don't typically see that from someone at age 35. 
Thielbar broke into the Majors as a sinker-slider lefty specialist, a role that is becoming obsolete in MLB. He didn't strike out many hitters, and his fastball mainly sat in the upper 80s. He had an eephus-like curveball that would range into the mid-60s that was always fun to watch hitters buckle at, but it was more of a gimmick pitch. 
Thielbar was far from that pitcher in 2022. He ditched the sinker in favor of exclusively four seamers, ramped up the velocity, and transformed his fluttering curveball into a bat-missing machine. Since his return to the Twins, Thielbar has turned himself into one of the most dominant left-handed relievers in all of baseball. 
In 2022 Thielbar saw career bests in fastball, slider, and curveball velocity at 92.8, 81.3, and 73.0 MPH, respectively. Compared to his age 28 season in 2015, the first year Baseball Savant had spin rate data, Thielbar also has seen his spin rates in his fastball jump from 2,091 RPMs in 2015 to 2,298 RPMs in 2022. He made similar progress in his breaking pitches: his slider went from 1,963 RPMs in 2015 to 2,368 in 2022, and his curveball went from 2,127 to 2,455. 
As a result of these pitch improvements, Thielbar's strikeout rate in his most recent two seasons is more than 10% higher than that of his first two seasons. These are not typical improvements from someone entering their mid to late 30s. 
This data is nice, but how has it resulted in his pitching? I mentioned earlier that Thielbar was a premier left-handed reliever in 2022, and here is why. According to Baseball Savant, Thielbar completed 2022 in the 99th percentile in average exit velocity against, 100th percentile in hard hit%, 94th percentile in xwOBA, and 89th percentile in xSLG. He was one of baseball's best pitchers in limiting hard contact. His improved pitch physicals also helped him miss bats; Thielbar finished 93rd percentile in K% and 80th percentile in swing and miss%. 
While batted ball data is valuable, it only tells part of the story. Sometimes results can still be underwhelming despite excellent peripherals. (Shoutout, Max Kepler). Fortunately for Thielbar, this is not the case. Using Fangraphs' splits tool, we can see Thielbar finished top ten among left-handed relievers that threw at least 50 innings in FIP (4th 2.42), xFIP (7th 3.07), K% (5th 32.7%), and K%-BB% (4th 25.3%). He also finished in the top 20 in batting average against (20th), OBP against (11th), SLG against (14th), and wOBA against (11th). 
Potential is a tricky thing to figure out. So many factors go into player development; we only see a small percentage of those as a fan. Perhaps Caleb Thielbar can help us change our perception of youth and potential. You don't have to be 22 years old to get better at baseball, and just because you hit age 30 doesn't mean you have to get worse. Maybe Caleb Thieblar can be a lesson for us when projecting a player's upside because, in 2013, I don't think anyone saw this coming from him.

It wasn’t long ago that the Minnesota Twins employed a veteran alongside Ryan Jeffers in the form of Mitch Garver. When he was traded to the Texas Rangers last offseason, Derek Falvey targeted Gary Sanchez in a deal that sent Josh Donaldson and Ben Rortvedt to the Yankees. Sanchez wasn’t awful, but didn’t make the strides that would’ve warranted a return.
While the catching market looked thin behind All-Star Willson Contreras, the Twins keyed in all along on former Boston Red Sox and Houston Astros backstop Christian Vazquez. Having spent the entirety of his professional career in Boston up until 2022, Vazquez was dealt at the trade deadline with the Red Sox falling out of contention.
At the time he was dealt, Vazquez owned a 109 OPS+ for Boston and was a solid defender with a great clubhouse presence. The position is not one that is often seen as a strong offensive contributor, but he’s remained slightly above-average in each full season since 2019.
 
 
Coming off a World Series victory with the Houston Astros, Vazquez has worked with every type of pitcher including future Hall of Famer Justin Verlander. He’ll look to handle a Twins pitching staff headlined by the trio of Sonny Gray, Tyler Mahle, and Joe Ryan. Kenta Maeda will also start the season in the rotation, and it’s well documented that Minnesota would like to add another starter.

Behind the plate, Vazquez has been a solid defender for the majority of his career. He ranked 22nd in pop time last season per Statscast and generated an additional framing run for his efforts. His 47.8% strike rate ranks just below former Astros teammate Martin Maldonado.
In signing Vazquez, Minnesota puts Jeffers back on the smaller end of a split. Similar to the scenario he was in with Garver, it should be expected that Vazquez operates as the 1A option among the pair. The Twins front office still has plenty of belief in Jeffers’ bat, and he’s come a long way defensively since the draft. If he can stay healthy, there’s a good chance he gets significant work against lefties and can raise his overall numbers.
The front office made their first substantial move of the offseason in addressing the catcher situation. They’ll now refocus their efforts on Carlos Correa at shortstop and what they can find on the starting pitching market.