Arizona Fall League Preview: Colorado Rockies
By Cameron Wright ·
Colorado's AFL contingent lands entirely with the Salt River Rafters, and the eight-man group reflects where the organization is: a system leaning on pitching depth and a couple of offensive sleepers rather than a headlining name. The key story coming in is Jack O'Dowd's cross-level offensive tear, but the subplot with organizational stakes belongs to Andy Perez, who is eligible for the Rule 5 draft for the second time this winter. Add Stu Flesland III's 1.88 ERA at Double-A, Sean Sullivan's work after his big-league debut, Konner Eaton's bat-missing arm and walk problem, and Jared Thomas making up lost time after two surgeries, and the Rafters' Rockies group gives the club plenty to evaluate over the next six weeks.
Jack O'Dowd's Bat Arrives at the Right Moment
O'Dowd, 25, signed with the Rockies as a minor-league free agent in January. He is listed as a catcher on the AFL roster and split his 2026 time among first base, designated hitter and catcher, though 80Grade's report projects him at second base, where he played every day in college. His season stats reflect a hitter who blew through two levels before running into the reality of Double-A. At Single-A Fresno he posted a .345/.385/.702 line with 7 home runs in 22 games, then carried almost all of it to High-A Spokane: .359/.451/.664 with 9 home runs, a 13.7 percent walk rate, and a strikeout rate under 18 percent in 153 plate appearances. Those walk and strikeout rates back up the production; he controlled the zone and punished mistakes.
The Double-A adjustment hit him the way it usually does. At Hartford, his average dropped to .254 with a 29.0 percent strikeout rate across 217 plate appearances, a meaningful jump from his High-A number. His walk rate held at 9.2 percent, and he still hit 7 home runs, so the underlying approach did not collapse. 80Grade's report flags his need to handle top-end velocity, and the strikeout jump at Hartford points the same way.
Across the full season, his combined line reads .307/.383/.564 with 23 home runs, 30 doubles, and 91 RBI in 107 games. The age-to-level context is fair to raise; this is not a 22-year-old outrunning a level. The AFL gives him more reps against upper-level pitching, and the question is whether the contact adjustments he needs against professional spin show up in the desert. If the swing decisions hold and the power plays, he becomes a candidate for the 40-man roster. If the Double-A strikeout rate creeps higher, the realistic ceiling stays at a second-division bat or multi-year bench piece.
Andy Perez and a Roster Clock
The note on Perez's AFL assignment is the most organizationally consequential detail in this group. He signed out of Cuba in January 2021, went unselected in his first Rule 5 draft last December, and is eligible again this winter while still off the 40-man roster. A strong showing in Arizona could push Colorado toward a 40-man decision. That context reframes what is already a solid 2026 season.
In 128 games at Double-A Hartford, Perez hit .285/.321/.403 with 9 home runs, 30 doubles, and 27 stolen bases. The strikeout rate of 15.9 percent is manageable for a contact-first left-handed hitter who is not hunting walks. The on-base percentage of .321 reflects that; his walk rate of 4.5 percent is light, and if he is going to profile as a shortstop regular rather than a utility piece, that number needs to move. 80Grade's report is honest about it: average hit tool, below-average power, above-average speed, and a glove at shortstop that grades as average and still needs to prove it can handle the position at the next level.
At 22 years old, the age works in his favor, and 27 stolen bases at Double-A tell you the speed is a genuine weapon, not just a counting-stat artifact. The AFL is probably the best stage for him: competitive at-bats against good arms, scouts in the stands, and a natural audition for front offices weighing Rule 5 options. He does not need to go 4-for-4 every night; he needs to show that the contact foundation and the speed translate against better competition.
Jared Thomas Making Up Lost Time
Thomas's 2026 season is best understood as a medical story with a baseball postscript. He had surgery for a fractured hamate bone in his right wrist last offseason, followed by a second procedure this spring to remove a bone spur, and he did not play until a four-game rehab stint in the Arizona Complex League in July. He then played 28 games at Double-A Hartford from July 30 on, hitting .270/.341/.405 with 4 home runs and 11 stolen bases. The combined line across 32 games shows a strikeout rate of 35.5 percent, which is elevated, though hamate injuries can sap contact and power for months after the procedure.
Thomas is the highest-ranked Rockie in this group as 80Grade's No. 9 Rockies prospect. He carries a 60 speed grade from 80Grade, an athleticism package that plays in a corner or slides to center in a pinch, and an offensive approach built around on-base skills and gap power rather than raw thump. The hit tool grades at 55 with real questions about spin recognition, and 80Grade projects him as a second-division regular in left field if the health holds. He is 23 with a second-round pedigree (the 42nd pick in 2024) and hit .300/.398/.452 with 33 steals across High-A and Double-A in 2025.
The AFL assignment is straightforward: he needs at-bats. A healthy, consistent fall with manageable strikeout rates would tell the org that the recovery is complete and that the Double-A assignment for 2027 is the right call. Any mechanical drift or continued contact struggles would extend the timeline.
Stu Flesland III's 1.88 ERA Earns a Second Look
Flesland, a 26-year-old lefty, posted a 1.88 ERA across 18 appearances (12 starts) and 86 innings at Double-A Hartford, with a 1.05 WHIP and a strikeout rate of 20.8 percent. He was even better after returning from the injured list on July 3, with a 1.38 ERA over 12 starts and 65 innings. His two Triple-A Albuquerque outings were early-season spot appearances on April 25 (3 scoreless innings) and May 15 (9 earned runs in one inning), and the Double-A body of work tells the clearer story.
The profile has limitations. The fastball averages about 89 mph and tops out at 93, and 80Grade grades the slider and changeup a tick below average. He is 26, so there is no developmental runway left; what he is now is largely what he is. But a 1.88 ERA with a 1.05 WHIP in 86 Double-A innings is not nothing, and the AFL gives him a chance to show whether that performance holds against better competition. The most realistic outcome is a depth starter or multi-inning reliever, and his AFL work will inform how much organizational confidence he carries into next spring.
Sean Sullivan's Command Meets a New Audience
Sullivan's reputation inside the Rockies system is built on deception and location rather than stuff. 80Grade's report grades his command at 60 and describes it as the best in the Rockies' minor-league system, and his 2025 season, mostly at Double-A Hartford, supported that with a 2.94 ERA and a 6.0 percent walk rate. The 2026 line tells a harder story: at Triple-A Albuquerque he posted a 5.31 ERA in 61 innings with a 1.56 WHIP, and his five MLB starts produced an 8.87 ERA and a 2.01 WHIP. The fastball sits around 88-92 mph and peaks at 95, delivered from a low three-quarter slot with extreme extension, which creates genuine deception, but major-league hitters adjusted. He also spent July and August on the injured list before a September rehab assignment.
The changeup grades at 50 and serves as his best secondary, but the slider at 40 leaves him with a limited arsenal when the deception stops working. The AFL gives him a chance to work on sequencing and sharpen the changeup in a lower-stakes setting than the big leagues. Whether the MLB profile is viable long-term is uncertain; the command-and-deception approach has a clear ceiling against elite hitters.
Konner Eaton's Walk Rate Is the Only Thing Standing in the Way
Eaton, a 23-year-old lefty, has a legitimate starter's arsenal: a fastball that averages about 94 mph and reaches 97, a slider that 80Grade grades at 55 and that misses bats, and a changeup that gives him a third option against right-handers. At Double-A Hartford in 2026 he struck out 103 batters in 107 innings over 23 starts, enough bat-missing to keep him in the rotation picture. The problem is the walk rate. He issued 61 walks in 107 innings, a BB% of 12.9, and he also allowed 19 home runs on the way to a 4.46 ERA.
The projection is a back-end starter with a plausible slide into multi-inning relief if the command never arrives. He is just over two full seasons into pro ball as a 2024 draftee, so the developmental runway exists. The AFL is probably about one thing for Eaton: can he sharpen first-pitch strikes and reduce the free passes without sacrificing the stuff? If the walk rate drops back to the 8 percent range he posted at High-A Spokane in 2025 while the strikeouts hold, the rotation case gets substantially stronger.
Round-Up: Fidel Ulloa and Hunter Mann
Fidel Ulloa had a useful Double-A season out of the Hartford bullpen: a 3.72 ERA in 46 innings across 36 appearances, with 49 strikeouts against 30 walks. The slider is his primary weapon, and 80Grade grades it as his best pitch. The walk rate of 14.7 percent is the concern, a jump from 8.1 percent in 2025, and it mirrors Eaton's command problems. The AFL gives him reps to sharpen his fastball command and to develop a changeup that 80Grade grades well below average, a pitch he needs as a third option.
Hunter Mann split 2026 between High-A Spokane and Double-A Hartford, posting a combined 4.33 ERA in 70⅔ innings with a 26.8 percent strikeout rate and a 9.5 percent walk rate. His 13 innings at Hartford came with a 5.54 ERA but improved walk numbers (6.6 percent) and a 29.5 percent strikeout rate, which is the right trend. A year after a 6.61 ERA and a 16.5 percent walk rate at Spokane, the AFL gives him more innings against upper-level hitters.
Bottom Line
The Rockie with the most at stake this fall is Andy Perez. O'Dowd had the better season on paper, but Perez's Rule 5 eligibility gives his AFL performance a concrete organizational decision attached to it. A strong showing in Arizona could earn him a 40-man spot and keep a 22-year-old shortstop who stole 27 bases at Double-A in the organization. The Rockies must set their 40-man roster by the November protection deadline, and if Perez is left off again, any club can take him in the Rule 5 draft in December.