In five seasons since being selected in the Rule 5 Draft by the Twins, Ryan Pressly has oscillated between very good (2016 version), and so-so (2017 version). This will be an especially pivotal year for Pressly. He's out of options, the front office added significant major league talent this offseason and relief talent is also present in the high minors. For a Twins team hoping to challenge for the AL Central, a poor start may mean the end of Pressly's tenure in Minnesota.

Image courtesy of Troy Taormina - USA Today Sports

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On paper, Ryan Pressly is everything the Twins want to help anchor a bullpen which has lacked dominant arms in recent years.Stuff-wise, Pressly is the kind of arm the Twins have needed to stick at the major league level. He can throw five pitches (fourseam fastball, cutter, slider, curve and sinker) and has well-above average velocity (his fastball averaged 96 mph in 2017).Pressly also generates a ton of swings and misses, with a 12.4 swinging strike %. For context, this was 38th in MLB for relievers who threw at least 60 innings, sandwiched right around Brad Hand and Bryan Shaw. So why hasn’t Pressly managed to produce more consistently excellent results, given his impressive arsenal?I’m about to do something extremely unfair to Ryan Pressly; compare him to Clayton Kershaw. That’s not really reasonable. Kershaw is perhaps, the greatest pitcher of his generation, a starter and left-handed. Pressly is none of those things. The comparison is useful, however.In the table below, you’ll see Kershaw’s vertical release points for all his pitches charted throughout the 2017 season. Notice the consistency in release points for his pitches (how clustered together they are). The result of this is all his pitches are coming at hitters from an extremely similar height, increasing the likelihood of deceiving the hitter. Pitchers typically go through subtle variations in their release points throughout the season. When Kershaw’s vertical release dips or increases in one pitch, the rest follow suit.*Data courtesy of BrooksBaseball.net By contrast, Pressly has wide fluctuations in his vertical release, both throughout the season, and in between his pitches. There are two months worth noting in his 2017 season: May, and August.In May, there was a much greater range in the vertical release points of Pressly’s fastball and slider (his primary two pitches). In August, he brought those two release points (although lower) much closer together. Pressly managed an ERA of 11.00 in May with a .324 BAA, and a 1.13 ERA in August with a 0.96 BAA. When he's able to release the ball from consistent vertical coordinates, regardless of the pitch, he has the velocity required to dominate opposing hitters.Pressly employs both a curveball and slider as breaking pitches. 2017 saw a significant reduction in the amount Pressly used his slider (dropping from around 25% to around 18%). Both of Pressly’s breaking pitches have fairly minimal vertical break and are both above average in velocity. When throwing breaking pitches without a ton of break, command is everything. Below are two charts mapping Pressly’s slider and curveball location in 2017.*Data courtesy of FanGraphs It’s immediately noticeable that Pressly leaves far too many sliders over the heart of the plate. By comparison, Pressly locates his curveball more consistently down and away to RHH (down and in to LHH).His slider command struggle is reflected in the effectiveness of both pitches in 2017. Pressly’s curveball had a .194 SLG against in 2017 (with around 21% whiffs), compared to .463 SLG for his slider (around 15% whiffs). In other words, when Pressly left his slider over the plate, the break he generates is not enough to save him, and excellent professional hitters tend to have their way with it.For one final comparison, the last chart here shows Pressly’s slider command in 2016, his best full season with the Twins. His ability to cluster slider location down in the zone is noticeable. In 2016, Pressly gave up a .375 SLG on his slider, and .089 ISO, compared with .256 ISO in 2017.*Data courtesy of FanGraphs On looking into Pressly’s numbers more closely, there’s only one conclusion to draw: He’s never established a great enough level of consistency in his mechanics throughout his tenure with the Twins. Variations in his release point and command struggles have diminished the impact of his incredible arm.If Pressly is going to stick in the Twins’ pen long term, mechanical consistency is the key element that needs to improve to capitalize on his excellent arm.