We update our fantasy baseball Top 700 Prospect Rankings weekly, and we keep track of the prospects who are rising the quickest to let fantasy baseball owners know about some prospects who are gaining momentum before you even hear about them elsewhere. This list comes out in tandem with the updated Top 700 fantasy baseball prospects list.
A power ranking of the fastest risers
Here’s our Power Rankings of the Top 10 fastest risers in this week’s update of the Top 700 Prospect Rankings. The entire list of the fastest risers, which includes the player’s major-league ETA, number of spots moved up and current new position in the Top 700, can be found HERE (subscription required).
1. Sebastian Walcott, SS, Rangers — AA, Age 20
Walcott is riding a four-straight-game home run streak at Double-A, the kind of hot stretch that vaults an already-elite prospect even higher. With a premium shortstop profile and huge raw power, there isn’t much more analysis needed here — he’s about as safe a foundational dynasty asset as exists in the minors.
2. Jesus Baez, SS/3B, Cardinals — AA, Age 21
Acquired from the Mets in last year’s trade deadline deal for Ryan Helsley, Baez has moved primarily to shortstop and is now tied for the second-most home runs in all of Minor League Baseball, with 38 homers in 110 games — a 55-homer pace over a full season. He’s in the middle of a scorching stretch that included a three-homer game and four homers in his last three contests. Yes, he shares a last name with (unrelated) Cardinals sensation Joshua Baez — St. Louis may have two of the more electric “Baez” breakouts in the minors this year.
3. Cooper Hjerpe, RHP, Cardinals — MLB, Age 25
Hjerpe’s road to the majors was anything but smooth — Tommy John surgery wiped out his entire 2025 season — but his debut on September 6 was one for the history books. He tossed four perfect innings of relief against the Rockies, striking out six of the 12 batters he faced without allowing a single baserunner, making him just the second pitcher ever (joining Max Scherzer) to throw four-plus hitless innings with six-plus strikeouts in an MLB debut.
4. Josue De Paula, OF, Dodgers — MLB, Age 21
De Paula has earned a promotion to the majors, capping a huge developmental year. His left-handed bat and advanced approach have made him one of the game’s most well-regarded outfield prospects, and with a big-league role now in hand, he’s shooting up boards across the industry.
5. Devin Taylor, OF, Athletics — AAA, Age 22
Taylor continues his ascent after a promotion to Triple-A Las Vegas following a huge season at Double-A Midland (.323, 14 HR, 54 RBI, .943 OPS). A 2025 second-round pick out of Indiana who set the Hoosiers’ all-time home run record, he’s one step from the majors.
6. Theo Gillen, 2B/SS, Rays — AA, Age 20
Gillen remains one of the game’s most well-rounded prospects, continuing his strong season at Double-A. The blend of hit tool, power, and speed keeps him firmly in the conversation as a top-tier dynasty asset regardless of format.
7. Yostin Pena, OF, Yankees — Single-A, Age 18
Pena keeps climbing for an 18-year-old who skipped the complex league entirely. He’s slashing .275/.385/.425 with 9 home runs, 47 RBI, and 34 stolen bases at Single-A Tampa, backed by elite exit velocities for his age.
8. Jackson Ferris, SP, Dodgers — AAA, Age 22
A former Cubs first-round talent acquired in the Michael Busch trade, Ferris made his Triple-A debut this year after being named the Dodgers’ Minor League Pitcher of the Year in 2024. He’s spent the offseason sharpening his changeup and curveball to diversify beyond a fastball-slider mix, and the added weapons appear to be translating into real helium.
9. Robert Calaz, OF, Rockies — High-A, Age 20
A $1.7 million international signee, Calaz has had an injury-interrupted developmental path but remains one of the more toolsy outfielders in a talented Rockies system. He can really run and has shown above-average raw power, though contact-rate questions remain part of his profile as he continues climbing at High-A.
10. Cesar Perdomo, LHP, Giants — MLB, Age 24
Perdomo got the call on September 1 and delivered immediately, working four innings of one-run relief with four strikeouts in his debut. He split this season between Double-A Richmond and Triple-A Sacramento, and while he projects more as a depth arm for now, the Giants have already signaled they’ll give him a look in the rotation down the stretch.
This week’s Top 10 Power Risers at a glance
| No. | Name | Pos | Team | B/T | Level | Age |
| 1 | Sebastian Walcott | SS | TEX | R/R | AA | 20 |
| 2 | Jesus Baez | SS/3B | STL | R/R | AA | 21 |
| 3 | Cooper Hjerpe | SPRP | STL | L/L | MLB | 25 |
| 4 | Josue De Paula | OF | LAD | L/L | MLB | 21 |
| 5 | Devin Taylor | OF | ATH | L/R | AAA | 22 |
| 6 | Theo Gillen | 2B/SS | TB | L/R | AA | 20 |
| 7 | Yostin Pena | OF | NYY | R/R | Single-A | 18 |
| 8 | Jackson Ferris | SPRP | LAD | L/L | AAA | 22 |
| 9 | Robert Calaz | OF | COL | R/R | High-A | 20 |
| 10 | Cesar Perdomo | SP | SF | L/L | MLB | 24 |