Welcome again, RotoBallers, to my weekly “Beginning Pitcher Arsenal Modifications” article sequence for Week 11 of the 2024 fantasy baseball season. Immediately’s article will focus on Reynaldo Lopez, Ryan Weathers, and Gavin Stone. For these new to this column, every week we cowl a number of beginning pitchers and their arsenal modifications through pitch combine, velocity, and motion. We’re at some extent the place the pitch motion, arsenal, and velocity ought to inform us a narrative with a handful of begins underneath their belts. With extra accidents doubtless coming quickly, we’ll need to proceed figuring out streaming pitcher abilities or struggling pitchers with underlying metrics suggesting higher outcomes coming quickly.
After inspecting the modifications for these beginning pitchers within the early elements of the 2024 season, we’ll summarize whether or not we should always act or be affected person with the information. We’re two months into the season with an honest pattern measurement of begins in 2024, and we’ll examine the present and previous info. This one is a bit beefier than traditional and for an excellent cause.
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Reynaldo Lopez’s 4-Seamer Modifications
It has been a rocky path from starter to reliever and again once more for Lopez. With the White Sox and different groups, Lopez carried out nicely as a reliever. From 2021 to 2023, Lopez posted a 3.14 ERA, 1.06 WHIP, 26.7 p.c strikeout charge, and seven.7 p.c stroll charge throughout 189 innings. It may be difficult for a reliever to transition to a starter, although generally the strikeout stuff stays nasty.
As a starter, we have seen Lopez’s four-seamer velocity decline to 95.3 mph, and it is anticipated with the transition. Curiously, Lopez’s four-seamer hasn’t generated the identical stage of arm-side run as in previous seasons. His four-seamer’s induced vertical break (IVB) of 16.7 inches is near current years, nevertheless it misplaced about 1-2 inches of horizontal motion.
Lopez’s vertical and horizontal launch factors shifted by about one inch on the four-seamer. That is considerably insignificant, and the rate modifications have contributed to the motion profile shift. Since Lopez’s four-seamer modified, the outcomes have not been as fruitful. Lopez’s four-seamer elicited a 12-13 p.c swinging strike charge in 2022 and 2023, dropping to five.8 p.c in 2024.
The primary speculation is a location difficulty for the four-seamer, nevertheless it seems like Lopez is finding the fastball in an identical space in 2024 in comparison with the earlier two seasons. He tends to throw the four-seamer excessive and out of doors to left-handed hitters. Theoretically, Lopez’s four-seamer ought to carry out extra just like the 2022 and 2023 numbers, given the IVB and placement with its average-ish vertical method angle (VAA). Nonetheless, the rate is the primary distinction.
Many of the injury in opposition to the four-seamer comes from left-handed hitters. In 2024, Lopez’s four-seamer had a .364 wOBA and 5.8 p.c swinging strike charge in opposition to lefties. For context, his four-seamer posted a .307 wOBA and 14 p.c swinging strike charge in 2022 and a .307 wOBA and 13 p.c swinging strike charge in 2023. It is attention-grabbing to see lefties crush the four-seamer in areas the place he throws it most frequently, although it aligns with the dip in whiffs.
The Slider is Dropping Extra
Lopez’s slider is dropping extra in 2024, with a career-high swinging strike charge of 24 p.c. That is practically seven proportion factors above his profession common. Theoretically, a pitch that drops extra ought to induce extra swings and misses. It is price noting Lopez’s slider vertical motion shifted considerably, with over 5 inches of drop.
The situation appears optimum, as he throws it down and away from right-handed hitters or low and inside to lefties. Fortunately, Lopez’s slider performs nicely in opposition to either side of the plate. In opposition to right-handed hitters, his slider boasts an elite .171 wOBA with a .117 wOBA versus lefties. Although there’s some luck in his favor with a .238 BABIP in 2024 in comparison with a profession common of .281, the talents and motion profile point out an above-average slider.
Abstract
It is a blended bag with Lopez with luck components in his favor (strand charge, BABIP), although he rocks an above-average swinging strike charge. On a pitch stage, Lopez’s four-seamer has been battling some minor motion modifications. The rate could be impacting his capacity to generate whiffs and weak contact. Nonetheless, Lopez’s slider seems soiled, with tons extra vertical motion supporting the swinging strike charge features. Whereas we did not focus on the curveball in-depth, it could be the wild card to watch since he throws it 17.3 p.c of the time to left-handed hitters with a .170 wOBA allowed. Lopez’s curveball would not generate a excessive swinging strike charge however can steal referred to as strikes.
Ryan Weathers’ Changeup is Dropping Extra
Weathers hasn’t been identified for the swinging strike charges, however we have seen extra strikeout upside in 2024. Earlier than 2024, Weathers hadn’t reached 15+ whiffs in a recreation. Nonetheless, he posted three video games with 15+ whiffs with a profession excessive of 21 in opposition to the Rangers on June 1.
His changeup elicited a 35.1 p.c swinging strike charge, practically double of his season-long common of 18.4 p.c. There is a cause for his changeup producing extra swings and misses. Weathers’ changeup has been dropping over 5 inches extra with an inch extra arm-side fade.
That is vital as a result of his changeup goes from a below-average pitch to a median or barely above-average one. With the added drop, the changeup’s ground-ball charge spiked to 57.7 p.c, over seven factors larger than in 2023.
In addition to the swinging strike charge enhance on the changeup, the outcomes improved in opposition to right-handed hitters, with a .245 wOBA (2024) in comparison with a .340 wOBA (2023). Sadly, it is Weathers’ solely pitch with a wOBA under .300 in opposition to opposite-handed hitters, which means he wants it to stay efficient.
In the meantime, lefties crush the changeup with an terrible .433 wOBA, although the .238 xwOBA suggests higher outcomes. It has been performing barely higher than in 2023 when Weathers allowed a .683 wOBA and .454 xwOBA versus left-handed hitters on the changeup.
It is unsurprising to search out the changeup struggling in opposition to left-handed hitters as a result of he tends to find it down and inside with arm-side fade to same-handed hitters. We’ll word that opposing offenses stack right-handed hitters in opposition to Weathers, so we’re coping with a small pattern, and this could be a moot level.
Why is the Sweeper Higher?
Weathers’ sweeper has been performing higher from a swinging strike charge of 15.6 p.c in comparison with 11 p.c in 2023. The identical pattern happens in batted-ball outcomes, with probably the most vital bounce in opposition to right-handed hitters. His sweeper permits a .299 wOBA in 2024 versus a .423 wOBA in 2023. The outcomes look even higher in opposition to left-handed hitters with a .203 wOBA (2023) and a .104 wOBA (2024).
Since it has been practically unhittable, there’s doubtless a motion profile change. Weathers’ sweeper added 1.5 mph of velocity, and it has been dropping 2.5 inches much less. The sweeper sometimes is not used for producing whiffs with a league-average 13.7 p.c swinging strike charge. Nonetheless, it tends to assist induce weak contact. Because the sweeper motion profile hasn’t modified a lot whereas gaining whiffs, there’s presumably a location change.
Weathers has been throwing the sweeper practically 12 proportion factors down and inside to right-handed hitters. That is a candy spot for the sweeper, permitting a .238 wOBA in 2024, much like a .193 wOBA in 2023. Just like the changeup, Weathers’ sweeper contributes to the ground-ball charge skyrocketing, evidenced by the 50 p.c ground-ball charge in 2024, over 20 factors above 2023.
That is a optimistic change in location, resulting in extra floor balls and continued weaker contact. So why not throw the changeup extra exterior the zone, low, and inside to right-handed hitters? That is what Weathers has been doing. He throws the sweeper extra exterior the zone with a 37.5 p.c zone charge, seven factors fewer than in 2023, and hitters have not been making contact (46.2 p.c contact charge).
Abstract
Weathers seems like he is evolving in 2024 (with most of his outcomes being earned) with some regression, given his 3.75 xERA. His spike in ground-ball charge through the changeup and sweeper helps preserve the house runs in examine. A pitcher producing extra floor balls with the changeup and a sweeper working nicely for whiffs and weak contact seems like a reduction model of Ranger Suarez or Cristopher Sanchez. Weathers would not have the sinker like Suarez and Sanchez, however perhaps he’ll need to add it to his arsenal.
Gavin Stone is Throwing Extra Sliders
Stone logged 15 or extra whiffs for the third time in his profession after 15 in opposition to the Rockies on June 2. He threw the slider 25 p.c of the time, the second most frequently. Stone’s slider elicited a 47.4 p.c swinging strike charge versus the Rockies, over double his season-long common (22.3 p.c).
He threw the slider at a season-high charge with a earlier excessive of twenty-two.2 p.c. Since Stone’s slider has been considered one of his high two finest pitches for producing whiffs along with the changeup, it is optimistic to see him use the breaking ball extra typically.
Stone’s slider velocity elevated by practically 3 mph. Unsurprisingly, his slider misplaced 4 inches of vertical motion and 4 inches of horizontal glove-side sweep. Nonetheless, it is attention-grabbing that his slider induces extra swings and misses whereas shedding motion to its profile. That is doubtless resulting from location modifications on the slider.
It is price noting we’re coping with small samples in 2023 and 2024. Stone locates his slider down and away exterior the zone from right-handed hitters and finds success. He lowered the zone charge on the slider from 57.5 p.c (2023) to 53.8 p.c in 2024, inflicting hitters to chase and whiff extra typically. The outcomes improved in opposition to righties versus the slider with a .223 wOBA in comparison with .353 in 2023, although the .318 xwOBA in 2024 hints at some regression.
Stone’s Lethal Changeup
It generally causes us to pause when a beginning pitcher depends closely on their changeup, which Stone tends to do, throwing it 26 p.c of the time in 2024. Nonetheless, Stone evenly mixes with the sinker (24.6 p.c) and four-seamer (23.9 p.c) with the changeup, so it isn’t an overreliance on the off-speed pitch.
Stone’s changeup has been lethal with an 18.8 p.c swinging strike charge, down over 5 proportion factors in 2023. He lowered his zone charge on the changeup to 31.7 p.c, over 12 proportion factors under 2023. Stone’s changeup stifles left-handed hitters, evidenced by a .192 wOBA in 2024 in comparison with .321 in 2023. He throws it about 1 mph more durable with slight and insignificant motion profile modifications.
Just like the slider, there is a location distinction for the changeup. The situation modifications enable the slider and changeup to carry out higher in 2024, which means non-fastballs can assault either side of the plate.
Abstract
Stone has been comparatively environment friendly, averaging 86 pitches and 5.7 innings per begin. That is doubtless one thing that continues, although he threw 124 innings within the minors plus 31 extra in 2023, so he can deal with a reasonable workload. He won’t have the near-elite stuff to generate tons of strikeouts, however he boasts stable management, with a 34.4 p.c ball charge. Count on some regression along with his xERA a few run larger than his precise, however the lethal changeup paired with the slider location resulting in extra whiffs and weak contact offers us extra confidence.
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