Should We Buyback Into Nick Pivetta?


Who doesn't like digging deep into the player pool? Sometimes I like digging into notable names that have the potential for deep league viability. In Nick Pivetta, we have a post, post, post, post-hype sleeper that's now on the Boston Red Sox. After a solid 2018 campaign, Pivetta struggled mightily. In the second half of 2019, the Phillies moved him into the bullpen. Pivetta started 2020 out of the bullpen, then the Red Sox acquired him in a trade and gave him a chance to start. We'll dig into Nick Pivetta's past seasons, his pitch mix, and see if we find any glimmers of hope for him moving forward. Hopefully, we'll help answer the question below - should we buyback into Nick Pivetta?

Should We Buyback into Nick Pivetta?

Nick Pivetta, SP, Boston Red Sox

Well, well, well, Nick Pivetta, we meet again after a decent 2018 season. Since the offseason hype in 2019, Pivetta struggled quite a bit, and that's putting it nicely. In 2018, Pivetta recorded a 4.77 ERA (3.51 SIERA), 1.30 WHIP, a 27.1% strikeout rate, and a 7.3% walk rate in 164 innings. Not bad right? Since then, he totaled 109.1 innings with a 5.60 ERA (4.67 xFIP) and 1.52 WHIP with a 21.5% strikeout rate and a 9.1% walk rate. That's not good.

Pivetta typically relied on his four-seamer, but it gradually dropped from 2017 to 2020. In 2017, Pivetta used his four-seamer over 54% of the time, and then in 2020, it finished with identical usage as 2019 right under 50% at 49.3%. Throughout that process, Pivetta increased his curveball and slider usage, which he threw above 20% in 2020. The results in 2019 and 2020 weren't great as noted above, but let's dig a little deeper into his profile.

Pitch Arsenal & Results

In the second half of 2019 and into 2020, Nick Pivetta struggled a bit. However, let's note that in his final two starts of 2020, he combined for ten total innings, five walks, and 13 strikeouts. His slider arguably rates as one of his best pitches with a 16.4% swinging-strike rate, a 46.2% whiff rate, and .290 xwOBA in 2020. With his arsenal, Pivetta should lower his four-seam usage, particularly since hitters crushed in in 2020 with a .552 xSLG and .353 wOBA on a fastball. In 2019, the results on the four-seamer ended up even worse yet slightly better in 2018.

On Baseball Savant, Nick Pivetta uses a four-pitch mix (four-seam, curve, slider, and changeup). He threw his slider (24.5%) and curveball (20%) relatively evenly. Pivetta barely used his changeup at 6.2%. FanGraphs lists Pivetta as using five to six pitches including a sinker and cutter. Regardless, he heavily relied on three pitches (four-seamer, curveball, slider).

As noted earlier, Pivetta's four-seamer stunk, but the breaking pitches performed decently. Given his heavy four-seamer usage, it's no surprise he finished with a brutal 2019 and 2020 season. The table below shows Pivetta's pitch mix and results on his top-3 most used pitches.

Nick Pivetta Pitch Mix & Results

Starting Pitcher vs. Relief Pitcher Results

First, we'll break down his 2019 and 2020 into starting pitcher and relief appearances. Then we'll dig into the game logs.

Starting vs. Relief Appearances

Sometimes when pitchers head to the bullpen, we see the numbers improve. Unfortunately, the results weren't as positive as one would hope. Later on, we'll touch on the two starts with the Red Sox. 

Digging Into the Game Logs

On the surface, outside of his breaking pitches, it's difficult to find any glimmers of hope. There's no way to slice it, but Pivetta struggled mightily outside of the final two starts in 2020. When digging into the game logs, we find a few solid starts by Pivetta.

He recorded a three-start stretch in 2019, where he totaled 21.2 innings, 5 ER, 2 BB, and 21 K. In those three starts, Pivetta lowered his four-seamer usage between 40-45.7%. He followed up those two starts with a similar usage on the four-seamer at 46.7% and 44.1% yet the results weren't the same. Unfortunately, he allowed ten earned runs and six walks with five strikeouts in 11 innings. Even though the results proved inconsistent, I think lowering the four-seamer usage is a smart move or at least adjusting the location.

In his final two starts of 2020 with the Red Sox, he performed well as seen in the table above. After digging into this, I noticed Jeff Zimmerman on FanGraphs noted Pivetta lowered the zone rate in those final two starts. Hopefully, that continues in 2021, especially since he could benefit from throwing pitches outside the zone a bit. In his final game with the Red Sox, Pivetta lowered his four-seam usage to 45.7% and kept up the usage of the breaking pitches. That's a good sign.

Pitch Mix Adjustment

It begs the question of whether Pivetta should lower the four-seamer usage. I'd argue yes given he allowed a .453 wOBA on the four-seamer from 2019-2020. That's slightly better than the Pirates' young pitcher in Mitch Keller, who also threw the four-seam a ton (50.3%) yet yielded a .447 wOBA. It also doesn't help that Pivetta throws the sucker in the heart of the zone. That said, I decided to dig into the plate discipline by each pitch on FanGraphs to see if we found notable changes. 

Nick Pivetta - Plate Discipline By Pitch

Outside of his best season in 2018, his curveball and slider performed worse across the board. He could benefit from lowering the zone rate on his four-seamer, while also lowering the zone rate on his curve and slider. That may help increase the chase rate that in turn could increase the swinging-strike and whiff rates. Pivetta's 2018 plate discipline blueprint looks much more appetizing.

The pitch arsenal and locations for Pivetta shown below give us an idea of how he located his pitches in 2020. Outside of his slider, the four-seamer and curve sit in the heart of the zone. It might help if he throws the four-seamer higher in the zone and lowers its usage.

should we buyback into Nick Pivetta

Nick Pivetta Pitch Arsenal Location

Release Point Changes

When looking at Brooks Baseball, Nick Pivetta raised his vertical release point and brought his horizontal release point closer to his body. If we use his four-seamer as an example, the vertical release point increased up to a quarter of a foot higher. His other pitches had similar increases on their release point as well. Again a significant change in the horizontal release point, and this case closer to his body. Thanks to my buddy Joe Drake of Prospects Live for helping me understand this a bit better. Below the graphs show us the differences. 

Vertical Release Point

 

Horizontal Release Point

Credit to Tate Schlichting for mentioning to me that he watched some of Pivetta's games from the Phillies and Red Sox. Tate noted a few tangible changes including a small tweak in Pivetta's mechanics. Based on Tate's observations and the Brooks Baseball data to back it up, it warrants further investigation with hopes of that continuing in 2021.

Horizontal Movement

In a side conversation with Alex Fast of Pitcher List, he mentioned looking into the vertical and horizontal movement given the release point changes. Well, what do you know - the vertical and horizontal movement on all pitches in 2020 changed. His four-seamer had slightly more vertical movement and less horizontal movement. Meanwhile, the vertical movement on his slider fell near his 2019 numbers and the vertical movement on the curve changed slightly as well. However, the horizontal movement on the slider increased while it decreased a bit with his curve. Although we're working with a small sample, these are interesting changes. 

Vertical Movement

Overall, we need to monitor these changes early into the 2021 season. If these release points and movement changes stick, then I'd want to dive into the spin direction and such in 2021. Could these be intentional changes or suggestions from the Red Sox pitching coaches? Possibly a mix of both or at least it seems that way.

2021 Outlook

Sometimes I imagine an island of Nick Pivetta truthers, and I may or may not be sailing towards there since I still have hope. As mentioned earlier, he's a post, post, post-hype sleeper. After his breakout 2018 season, Pivetta hasn't lived up to the hype. Even in 2019, the Phillies sent him down and he performed well in Triple-A. Somewhat mixed results on Pivetta, but a few people responded considering similar pitch mix adjustments that should help him.

ATC projects Nick Pivetta for a 5.21 ERA and 1.43 WHIP with an 8.66 K/9 and 3.48 BB/9 in 94 innings. All that looks disgusting. Given the lack of depth in the Red Sox rotation, Pivetta should start in the rotation in 2021. However, he could lose his spot when Chris Sale returns or Tanner Houck earns a chance again. With an ADP after pick 450, he's unlikely to be drafted outside of best-ball formats. Don't forget about Pivetta because a pitch mix change plus adjusting his pitch location should help him out. Monitor the release point and pitch movement changes since they also provide reasons for optimism.

Should we buyback into Nick Pivetta? If these changes stick over the first few starts of the season, I'm ready to buy back in on him in 2021 assuming these adjustments elicit positive results.

Feature Photo Credit: AP Photo/Michael Dwyer

Data Courtesy of FanGraphs, Baseball Savant, and Brooks Baseball

Follow me on Twitter @Corbin_Young21


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