MLB’s 30 Biggest Prospect Breakouts of 2026, Team by Team

Every farm system had a player who changed the conversation in 2026. Some came back from surgery, some outran their old scouting reports, and some climbed two or three rungs before the summer was out. Here is the clubhouse ledger on the 30 prospects who made the biggest jump.

2026 Farm System Breakout Notes

SEO Title: MLB 2026 Breakout Prospect Notes: One Rising Player From Every Farm System

SEO Description: A clubhouse-style look at the 2026 breakout prospect in all 30 MLB organizations, with minor league lines, promotions, injuries and the stories behind the numbers.

American League East

Perry missed all of 2025 after Tommy John surgery and opened this season off Toronto’s Top 30 list. By the end, the 2022 12th-rounder was the organization’s No. 2 prospect and No. 94 overall, armed with a revived 93-95 mph fastball, a slider and curveball that miss bats, and a mid-80s splitter that took a step forward.

Hunter, a 2025 sixth-round selection from USC, made Single-A Delmarva look temporary. He earned two promotions and led all qualified Minor League pitchers with at least 100 innings in strikeouts per nine innings and strikeout percentage. He also ranked second in average allowed and third in K-BB percentage.

Flemming began as Tampa Bay’s No. 28 prospect despite being a second-round pick in 2025. The 6-foot-3 infielder became the Carolina League MVP at Charleston, and his first full season suggested more power may be waiting as he moves into his 20s.

Primera signed out of Venezuela for $10,000 in 2024, then made a loud American debut at 19. He handled Rookie-level and Single-A pitching, hit 13 homers, and showed enough defensive ability behind the plate to remain a legitimate catcher as well as a first-base option.

De Pena arrived from the Angels in the Oswald Peraza deal at the 2025 Trade Deadline. The 19-year-old won the Florida Complex League Triple Crown and finished first in the league in slugging, OPS, hits, doubles, extra-base hits and total bases. His Single-A promotion brought some struggle, but not enough to hide his raw power or plus running ability.

American League Central

Caceres played through an oblique issue while putting together an impressive first extended run in full-season ball. At only 18, he performed across two Class A stops and rose as the best prospect from Cleveland’s 2024 international group, despite receiving only the eighth-largest bonus in that class at $300,000.

Lamkin carried a strong spring into the regular schedule, needing just six High-A starts before reaching Double-A. A shoulder strain stopped his season after two outings there, but the left-hander had already established himself as Kansas City’s third-ranked pitching prospect. He is expected in the Arizona Fall League with a 91-94 mph fastball, an 80-83 mph slider that produced a 55 percent whiff rate, and solid control.

Callahan finally got a healthy, extended season at age 24. The former St. Joseph’s player had never appeared in more than 71 games or advanced beyond High-A in his first three professional years. He set career highs in homers and steals, reached the Majors on Aug. 16, and has worked mostly in left field for Detroit.

Diaw’s ability was never much of a question; availability had been. A broken thumb limited his Draft year at Loyola Marymount, followed by a broken wrist and then a hamstring problem in pro ball. He cleared 100 games, reached Double-A, led Minnesota farmhands with a 130 wRC+, and moved from No. 23 into the club’s top 10 while catching and playing center field.

DePino’s Rhode Island résumé included single-season and career school records for runs, homers, extra-base hits, total bases and walks. Clubs questioned the age and right-handed first-base profile of the 22-year-old, even after his 20-homer, 20-steal college season. Chicago took him in the seventh round, and his first full campaign answered with 25 home runs between High-A and Double-A.

American League West

Alvarez put up an .875 OPS at Single-A, then held his own after the Angels sent the teenager to High-A Tri-City. He finished with 49 extra-base hits and 53 stolen bases, moved from No. 12 to No. 3 in the organization, and entered the broader Top 100 discussion.

Schiavone, an 11th-round pick from James Madison in 2024, pushed through High-A, Double-A and Triple-A. He has elite exit velocity and an unusually patient eye, though there is still plenty of swing-and-miss in the profile. One more steal during the final week of the Triple-A season would make him the first Minor League catcher with a 30-homer, 30-steal year since Willie Royster in 1981.

Guedez signed for $1.5 million in January 2025 and hit .359 with an .885 OPS in the Dominican Summer League at 17. He skipped the Arizona Complex League this season and went from Stockton to High-A Lansing. The strikeout-to-walk count, 132 to 28, remains unfinished business, but Oakland saw enough to move him from No. 23 into its top 10.

Smith changed uniforms repeatedly. The Nationals drafted him in the sixth round in 2025, dealt him to the White Sox before this season began, and Chicago sent him to Seattle at the Deadline in the Luis Castillo trade. He had 22 homers in 79 games before the Mariners acquired him, added nine more afterward, and joined a short list of Minor League hitters with more than 30 homers. His 97 walks ranked among the top 20 in the minors, while his 158 combined wRC+ ranked fourth among all hitters.

Osorio signed for $47,500 out of Venezuela in 2022 and spent three years in Rookie ball before his full-season debut in 2025. His bat-to-ball ability and instincts played loudly across two Class A levels, where he walked 54 times against 50 strikeouts. Back trouble ended his season after mid-July.

National League East

Hartman was a 20th-round Canadian high school pick in 2024 and started 2026 ranked No. 21 in Atlanta’s system. At 20, he crushed 24 homers and stole 38 bases in 94 High-A games to earn a Double-A shot. That level tested him, but he still finished as the Braves’ No. 1 prospect and No. 41 overall.

Compton’s redshirt sophomore year at Arizona State lacked power and helped push him into the second round of the 2025 Draft. His first complete professional season told a different story. From High-A through Triple-A, he ranked fifth in the Minors in OPS at .994, seventh in homers and eighth in slugging.

Pitre was a 2024 second-rounder who could not crack Tampa Bay’s preseason Top 30, then hit his way into a trade that sent him to the Mets in the Freddy Peralta return. Now at Triple-A Syracuse, he has walked 80 times while striking out only 57. His 1.4 walk-to-strikeout ratio ranks second among 729 qualified full-season Minor Leaguers.

Cruz arrived from the Cubs in last year’s Michael Soroka deal and opened this year as Washington’s No. 25 prospect. He starred in spring workouts, tore through 14 games at Single-A Fredericksburg, then encountered rougher going after his quick move to High-A Wilmington. He recovered late, posting a .511 slugging percentage and a 16.7 percent strikeout rate over his final 24 games. The power-speed upside remains, and he will enter his age-20 season trending upward again.

Rincon’s defense at shortstop had always given him a path, but health and offensive production had not matched the glove until this season. The 2022 14th-round pick led the Eastern League in OPS and walks, tied for the league lead in homers, and controlled the strike zone even as the power arrived. At 22, he is now Philadelphia’s No. 4 prospect and No. 100 overall.

National League Central

Moneys signed for $1.15 million, the third-largest bonus in Milwaukee’s 2026 international class. The Dominican Summer League can inflate offensive lines, but his underlying data supported the production. He combined easy power, 28 steals and an almost even 45-strikeout, 46-walk ledger in 53 games.

Frias opened his first stateside season in the Milwaukee system and flashed premium bat speed and exit velocity from the left side. The Brewers moved him, along with Josiah Ragsdale, to St. Louis in the Deadline package for Dustin May and JoJo Romero. At 18, Frias already has Top 100 buzz after a season that included 10 homers, 25 steals and a 130 wRC+ from the Arizona Complex League through Single-A.

Hartshorn received a record $2 million bonus for a sixth-rounder when Chicago drafted him out of a California high school in 2025. The Cubs did not expect the 19-year-old to reach Double-A so soon. He did it with disciplined swing decisions, considerable power for his age and a productive run from Single-A upward.

Gray did not play after signing, in part because Pittsburgh wanted him to work on a habit of chasing pitches. He began at Single-A Bradenton and did not stay there long, blasting 32 homers before ending the year at Double-A. His chase rate remained at 30 percent, but his walk rate jumped significantly from his final Fresno State season, strengthening the belief that the bat can work in the Majors.

Morillo signed for $420,000 in January 2024, spent two summers in the Dominican Summer League, and came to the United States this year at 19. The switch-hitting catcher moved out of the Arizona Complex League and into full-season ball, finishing fourth in Cincinnati’s system in wRC+ among players with at least 250 plate appearances. He rose from No. 24 in the preseason rankings to No. 9.

National League West

Virahonda was Arizona’s breakout choice a year ago, and he took another sizable step in 2026. Defense remains his strongest calling card, but the catcher nearly quintupled his previous career home-run high with 19 across three levels. He now sits fifth in the D-backs system and will compete with Ryder Helfrick, Alberto Barriga and Ivan Luciano for the organization’s long-term catching job.

Harlan, a 2024 third-round pick from a Pennsylvania high school, signed for an over-slot $1,747,500. Better pitch selection and more frequent contact helped his raw power show up in games. An oblique injury cost him the final six weeks, but his work across two Class A levels moved him to No. 9 in the Dodgers system.

Cox came to San Francisco from the Athletics in the February 2024 Ross Stripling trade. His first two seasons with the Giants produced a .261/.352/.386 line, but adjustments to his right-handed swing and a more selective approach transformed his year. The son of former Major League catcher Darron Cox exploded at Double-A and Triple-A, then spent most of the past three-plus months as a semi-regular in San Francisco, graduating from the club’s Top 30 list.

Balzer’s first full season brought a 7.92 ERA and 1.78 WHIP in 50 innings at Single-A Lake Elsinore. He nearly doubled his workload in 2026, reached High-A and improved his results. The 6-foot-1 right-hander can touch triple digits, generally works with two fastballs closer to the mid-90s, and gets the strongest reviews for a mid-80s sweeper. A splitter and cutter give him additional shapes.

Arguelles signed for $700,000 in January 2024 and won a Dominican Summer League batting title at .422, along with league MVP honors, before showing the production could travel. He led the Arizona Complex League with a .402 average, earned a move to Fresno, and completed the year with 23 doubles, 10 triples and 11 homers. His 11.0 percent walk rate nearly matched his 12.0 percent strikeout rate, a steady finish to a 137 wRC+ season.