Are You a Beginning Pitcher Who Needs the Platoon Benefit? Too Unhealthy!

I used to be considering Astros right-hander Hunter Brown the opposite day — I think about this can be a subject lots of you ponder usually as effectively — and once I checked out his Baseball Savant web page, I discovered myself a bit of nonplussed:

Brown is a kind of pitchers who throws three fastballs; his thrilling midseason turnaround owes a lot to the addition of a sinker. However wow, he’s thrown numerous fastballs to left-handed hitters, hasn’t he?

It’s not as skewed because it seems to be; in relation to fastballs, Brown has a particular pitch for hitters on the appropriate aspect of the plate. (Should you hear a thumping sound, ignore it. It’s the late CIA director Allen Dulles, pounding on the lid of his coffin as a result of he heard “particular pitch for the appropriate” and has been introduced again from the lifeless by sheer drive of FOMO.) Brown has thrown about as many fastballs whole to every sort of hitter.

However even that’s a bit of odd. In the case of the platoon splits for main leaguers, the rule of thumb I exploit is two-thirds right-handed, one-third left-handed. You will have seen me utilizing that quantity heuristically in my evaluation right here. It’s not, nevertheless, a exact illustration of the main league inhabitants.

To be clear, Brown is a little bit of an outlier. By way of Monday’s video games, there have been 321 pitchers who had thrown 750 or extra pitches within the majors this yr. Brown had thrown the ninth-highest proportion of these pitches (56.8%) to left-handed batters. In actual fact, his teammate, Spencer Arrighetti, was no. 2, so possibly there’s one thing in regards to the Astros that pulls left-handed hitters.

To date this season, beginning pitchers have been liable for greater than 88,000 main league plate appearances. Primarily based on pitcher throwing hand and batter hitting aspect, right here’s how these plate appearances have been distributed:

So yeah, seems the median right-handed starter truly faces barely extra left-handed hitters than right-handed. And it’s not a 2-to-1 break up; it’s virtually 3-to-1 for pitchers. For hitters, it’s extra even — 57.6% to 42.4% — due to switch-hitters, and youngsters who grew up with overly formidable mother and father who turned them into bats-left-throws-right guys as a result of that’s essentially the most advantageous mixture for a serious league participant. (This being the unhappy interregnum between the main league careers of Pat Venditte and Jurrangelo Cijntje, there are not any switch-pitchers within the large leagues for the time being.)

However between switch-hitters, platoons, stacking the lineup with righties in opposition to powerful lefties, and so forth, the web final result is that more often than not, no person has the platoon benefit.

Effectively, no person besides left-handed hitters:

There are such a lot of right-handed individuals in baseball that right-handed hitters are working in opposition to same-handed pitchers… OK, that is virtually precisely 2-to-1, it seems. However there are sufficient switch-hitters and left-handed hitters within the sport that opposing managers can simply barely recover from the hump in opposition to right-handed starters.

I’d present you a desk of the pitchers who function with out the platoon benefit most steadily, but it surely’s mainly congruent with an inventory of left-handed pitchers. The primary 62 pitchers on the record are left-handed, adopted by Gerrit Cole, then 11 extra lefties, then Arrighetti.

However the pitcher who faces the fewest lefties of anybody in baseball is Tarik Skubal. Garrett Crochet is fourth-lowest, adopted by Chris Sale. Framber Valdez, Blake Snell, Ranger Suárez, and Cole Ragans are within the prime 15. These are among the greatest left-handed starters in baseball. But additionally within the prime 15? Kyle Freeland, Patrick Sandoval, and Jordan Montgomery.

So when managers take all of the lefties out of the lineup in opposition to a left-handed starter, is it as a result of the starter kills left-handed hitters and each out is treasured? Or is it as a result of anybody can hit this joker, so this can be a delicate goal for the right-handed part-time gamers who want a delicate goal?

It’s a bit of of each.

Normally, the pitchers who face essentially the most left-handed hitters are lefty relievers, who function with the platoon benefit twice as typically as starters. The LOOGY could also be an artifact of days passed by, however the LTOGY (“litoogie” or “Lieutenant Ogy”) appears to be going sturdy despite the three-batter minimal. Let’s zero again in on starters.

League-wide this season, left-handed pitchers have confronted left-handed batters 27.9% of the time and surrendered a wOBA of .294 in opposition to them. Proper-handed pitchers have confronted lefties 48.2% of the time and have allowed a wOBA of .320. In the beginning of the sport, the offense has the benefit of understanding who it’s going to be going through: The opposing starter, and which hand he throws with, is thought hours prematurely of the sport, often days. However as soon as the sport begins and relievers enter the image, the data benefit swings again to the protection; when a supervisor makes a pitching change, he is aware of which three batters his reliever goes to face, and with quick benches, the offense has little if any alternative to make a countermove. For this reason lefty relievers have the platoon benefit twice as typically as lefty starters do.

Because of this, the left-handed pitchers who’ve essentially the most disproportionately lefty-heavy workloads are virtually all high-volume relievers. So let’s zoom again out and give attention to beginning pitchers for a second.

This yr, the common left-handed starter has thrown 20.6% of his pitches to left-handed hitters. The typical right-handed starter has thrown 51.1% of his pitches to left-handed hitters. Listed below are the pitchers who, having been used predominantly out of the rotation this season, have confronted essentially the most disproportionately left-handed opponents, controlling for pitcher throwing hand:

It’s a combination. You’ve obtained some killer right-handed starters in there, however this group is a hodgepodge of excellent pitchers and innings eaters, and it’s a coin flip whether or not a pitcher on this record is definitely higher in opposition to righties than lefties.

Flipping the record upside-down, to the starters who face essentially the most disproportionately right-handed lineups, is a bit of completely different:

Most of those pitchers truly do pitch left-handed hitters fairly effectively. Musgrove and Woods Richardson, as an example, have reverse splits. Skubal is nails in opposition to everybody, however his opponent wOBA is 35 factors higher in opposition to lefties than righties. Freeland has been horrendous total, however he’s been virtually common while you isolate the pattern to same-handed batters. (Turnbull and Ortiz have break up their seasons between the rotation and the bullpen, however I included them right here simply because.)

Enjoying matchups within the beginning lineup is not at all an actual science; in some instances, the platoon benefit doesn’t make the highest 5 most vital professionals or cons for taking part in or sitting a specific hitter. However Brown, relentlessly chucking four-seamers previous one left-handed hitter after one other, is just not as a lot of an outlier as I’d initially thought.