
Introduction
While I agree with the general consensus that the Diamondbacks biggest weakness is a failure to develop pitching prospects, and it’s not a strength for the organization, I find most of the criticisms of the current Arizona farm system laughable, when the vast majority of critics can’t name anyone in the farm system. That usually says to me that they have no idea what they are talking about, because there are actually quite a few interesting pitching prospects in the system, some with significant upside. So I thought I’d change that, with a series of articles doing a deep dive into the teams pitching prospects. This was originally one long article but I decided to make it a little more digestible by breaking it into multiple articles. Today I’ll be discussing the lack of LHP prospects and then discussing four RHP prospects with very high upside
Where all the lefties?
Take a quick look at the handedness of the prospects below, and I’m sure you’ll ask yourself, ‘where are all the left handed pitchers?‘ To give you the shortest possible answer, you’ve already seen them. Mitch Bratt and Kohl Drake are basically the only LHP prospects of note in the upper levels of the Diamondbacks farm system. The long answer is the pickings are slim when trying to find a LHP worth talking about in the upper levels. There ARE some LHP, but only a couple really worth mentioning at the moment.
Yu-Min Lin is a 23 year old left handed starter who has struggled as a finesse pitcher in the very hitter friendly PCL, but was at one point one of the higher ranked prospects a few years ago. It’s worth mentioning that he had a horrific baseball related injury, getting struck in the face by a line drive foul ball. I wouldn’t be surprised if he has had some lingering effects from the injury, as I’d be shocked if he didn’t also have a concussion. He’s still young, so I wouldn’t be surprised to see him get an emergency spot start eventually with the Dbacks. In my opinion, if Lin ever makes it the majors and finds success, it’ll be with some other MLB organization, better equipped to develop him as a pitcher, which doesn’t have a AAA affiliate akin to pitching on the moon. Lin is barely a prospect at this point, if not for his age; giving him the benefit of the doubt, mostly as a result of that injury; and the fact that he’s honestly just a very bad fit for pitching in Reno. Lin relies mostly on off-speed and breaking pitches, while Reno is a place where pitches just don’t break as a result of the altitude.
Rio Britton is a guy who was drafted in 2023, pitched 68 innings with a 3.97 era and 4.10 FIP in A level Visalia in 2024, then did not pitch at all again until this year, thanks to being put on the full season injured list for 2025. In 2026 Britton has pitched in 22 games for A+ level Hillsboro, 15 of which have been starts. He’s tossed 91.1 inning with a 4.53 ERA, a 4.68 FIP, and a 4.47 xFIP. While that may not seem particularly good or noteworthy, it’s actually slightly above average, as shown by 92 ERA- and 96 FIP- (both adjusted stats where anything below 100 is above average). He looks solid enough this season that I think he’s a name worth keeping an eye on now that he’s healthy. That said, he’s essentially a non-prospect until he can prove he’s healthy and advances a little further into the system.
Lin and Britton are basically the Ur-Examples for LHP in the Dbacks system. You have guys who have been injured and struggled in the upper levels of the system like Lin, and then you have guys like Britton, who aside from being injured, just haven’t pitched enough to be really talked about.
Four Flamethrowing RHPs
For each player I’ve written about below, I’ve linked their Fangraphs and Baseball-Reference player pages, as well as a direct link to their blurbs on MLB pipeline that have a more detailed scouting report than I can offer. Scouting grades are the traditional 20-80 scale.
Dean Livingston (FG | B-Ref | Pipeline)
Bats/Throws: R/R Height/Weight: 6’4″ / 205lbs Born: 9/7/2006
Scouting grades:Fastball: 60 | Curveball: 55 | Slider: 50 Control: 50
Background: The Diamondbacks generally haven’t drafted high school arms early in the draft, at least not very often. Livingston was the rare exception in last years draft, the Dbacks giving him $1 million to keep him off campus at Georgia. Livingston didn’t get into professional game until this season, and he’s honestly been a revelation in 2026.
Livingston’s season started out with the ACL D-backs, where he pitched in 14 innings across three games, but dominated, giving up just a pair of earned runs on eight hits, four walks, and a wild pitch, but struck out 17 batters. That adds up to a 1.29 ERA with a 3.33 FIP and a 3.97 xFIP. His 22 ERA- and 54 FIP- show just how dominant he was relative to the league. He was less impressive while he was in Visalia, but still above average based on his 77 ERA-. He was recently promoted to Hillsboro and had a promising debut with the Hops, pitching five innings and allowing a run on three hits and two walks, while striking out six batters.
I couldn’t find much video of Livingston pitching, but I did manage to find a couple videos of him back in May, which I’ve embedded below.
My Scouting Report: Livingston has the ideal height, weight and build that you look for when scouting a pitcher. He throws a four seam and two seam fastball that sit in the mid to upper 90s, but he’s touched triple digits on occasion in 2026. His slider and changeup are much more advanced than you would expect, but still need to be developed further. He doesn’t turn 20 until September 7th, so he has the advantage of youth on his side. He is one of the top pitchers to watch next season.
David Hagaman (FG | B-Ref | Pipeline )
Bats/Throws: R/R Height/Weight 6’4″ / 215lbsBorn: 4/16/2003
Scouting grades: Fastball: 55 | Curveball: 60 | Slider: 50 | Changeup: 50 | Control: 50
Background: Hagaman is a name you should honestly know already, as the team’s current top pitching prospect (according to Baseball America). Acquired by the Diamondbacks a little over a year ago in the Merrill Kelly trade (along with Mitch Bratt and Kohl Drake) I think most people considered him to be the third piece in the deal. But his potential was obvious to me, as he adds much more significant velocity and louder stuff in general, especially compared to either of the two lefties. In 2026, I think it’s fair to say he’s broken out as a pitcher.
Hagaman did a few interviews during the fall league last year that I thought were a good insight, which have been compiled in the videos below.
My Scouting Report: Hagaman is much better than advertised. All four of his pitches look above average to me. His slider is the weakest and least developed of the four pitches, but I’d still grade it as average even if i was little more pessimistic in my writeup. His high 90s fastball is the weakest of the four players mentioned, but it’s still a plus fastball. If Hagaman continues to dominate down the stretch, he could potentially land on a few top 100 prospect lists this winter.
Brian Curley (FG | B-Ref | Pipeline )
Bats/Throws: R/R Height/Weight 5’10” / 212lbs Born: 6/1/2003
Scouting Grades: Fastball: 60 | Curveball: 40 | Slider: 55 | Control: 45
Background: I actually don’t have too much to say about Curley’s time with the Georgia Bulldogs, as they have produced some excellent videos covering that time in his career that are embedded below.
Curley’s 2026 has been a bit of a mixed bag. In 69.2 innings in A+ Level Hillsboro, he put up a 4.52 ERA, 3.54 FIP, and a 3.35 xFIP. Those numbers translate to a slightly above average 92 ERA- and a decidedly above average 72 FIP-. His promotion to AA Amarillo, however, has gone how you’d expect. In 35.1 IP his ERA is 7.13, his FIP 6.89, and his xFIP 5.43. I don’t think you need to see his 122 ERA- and 124 FIP- to understand that those aren’t very good numbers.
My Scouting Report: Curley sits 95-96 mph and touches triple digits with his fastball. He gets above-average carry and it plays up further due to a low release height and unusual approach angle. His upper-80s slider has both depth and power. His curveball is more of a top-to-bottom offering, and he also threw a third breaking ball, a sweeper, though the three could blend together. He also has a fringe-average changeup. Curley has excellent makeup and has the personality to succeed at the highest level. As an undersized pitcher throwing that hard, he might be better off being shifted to relief, but I’d imagine the Diamondbacks will give him every chance to stick as a starter. Depending on how he pitches down the stretch in Amarillo, I could see the Dbacks starting him back in AA next season, or being even more aggressive with his promotion and having him start in Reno. Obviously if he pitches like he has so far, expect him back in Amarillo to start his next season.
Patrick Forbes (FG | B-Ref | Pipeline )
Bats/Throws: R/R Height/Weight: 6’3/220lbs Born: 7/11/2004
Scouting Grades: Fastball: 60 | Slider: 60 | Cutter: 40+| Changeup: 40+ | Control: 50
Kentucky’s 2022 Mr. Baseball, Forbes was a star shortstop at Bowling Green High, but went undrafted in part because of his strong commitment to Louisville. A two-way player as a college freshman, he only decided to pitch full-time during his sophomore year. A year later, in 2025, his draft stock skyrocketed early on as he dominated for the first month of the season, but a flexor injury and less control lead to him falling in the draft to the Diamondbacks at #31. The Diamondbacks shut him down after the draft, and he’s only gotten into pro games this year. I could find limited video of Forbes pitching in the Diamondback system, but I did manage to find a couple, which I’ve embedded below to give you a better idea visually of the kind of pitcher he is.
Forbes started the year on the IL and wasn’t activated with Hillsboro until June, but he has looked solid this season as the Dbacks build up his workload. Including the two innings he pitched in the ACL in his rehab start, Forbes has pitched 29⅔IP with a 2.73 ERA with a 3.56 FIP and a 3.34 FIP. He’s struck out 35.3% of the batters he faced, while walking only 6% of batters. His 55 ERA- and 73 FIP- further hammers home his dominance.
My Scouting Report: Forbes has an explosive fastball with a lowish release point, that tops out in the low triple digits, but he generally works in the mid to high 90s. He has an above average slider with good horizontal movement that compliments his fastball extremely well. His other pitches need work, but they grade to at least average at the moment. I’ve been even more impressed with Forbes’ control this season, as it’s been better than advertised.
Conclusion
The Diamondbacks have done well in the last couple seasons to add pitching over the last few seasons with actual upside. Hagaman is the closest to actually making it to the MLB level, but I would expect the other three to move through the system fairly quickly if they stay healthy and pitch well. Next time we’ll look at four more pitchers and go over some teenage prospects that could be worth keeping an eye on.










