Gerber is set to make his Triple-A debut on Friday, one day after he connected on his 13th home run of the season, a three-run shot for Double-A Erie. The 25-year-old outfielder slashed .291/.363/.477 over 92 games during his time in the Eastern League, totaling 62 runs scored, 37 extra-base hits and 10 stolen bases.
Armenteros has given up just one hit in each of his back-to-back scoreless starts for Triple-A Fresno, completing seven and eight innings, respectively, while piling up a total of 17 strikeouts. That dominance extends across his past five starts, during which the 23-year-old righty has pitched to a 0.88 ERA with a 45-to-9 strikeout-to-walk ratio in 30 2/3 innings. Overall, Arementeros has put himself firmly on the big league radar this season by posting a 1.97 ERA with a .202 opponents' average and 142 strikeouts in 118 2/3 innings (10.8 K/9) across two levels.
Allard, MLBPipeline.com's No. 25 prospect, turned in one of his best performances of the season last time out, scattering five hits over seven scoreless innings with nine strikeouts in a win for Double-A Mississippi. It was a continuation of what has been a hugely impressive 2017 campaign for the 20-year-old lefty, who has posted a 3.34 ERA with 124 strikeouts over 143 innings (26 starts) in the Southern League in his age-19 season.
Guerrero, 23, was a Southern League All-Star for Birmingham after he posted a 3.89 ERA with 88 strikeouts and 17 walks over 78 2/3 innings (13 starts) in the first half. The left-hander has struggled down the stretch, however, pitching to a 7.58 ERA with a .363 opponents' average and 10 walks across 19 frames (four starts) in August.
Friday's Top 100 prospect probables
No. 12 Michael Kopech (White Sox No. 3), Charlotte vs. Norfolk (7:05 p.m. ET on MiLB.TV)
No. 21 Hunter Greene (Reds' No. 2), Billings at Missoula (8:35 p.m. ET)
No. 22 Mitch Keller (Pirates' No. 2), Altoona vs. Harrisburg (6 p.m. ET on MiLB.TV)
No. 35 Kyle Wright (Braves' No. 4), Florida at Daytona (7:05 p.m. ET)
No. 38 Mike Soroka (Braves' No. 5), Mississippi vs. Birmingham Game 2 (TBD on MiLB.TV)
No. 51 Yadier Alvarez (Dodgers' No. 3), Tulsa vs. NW Arkansas (8:05 p.m. ET on MiLB.TV)
No. 95 Beau Burrows (Tigers' No. 4), Erie at Akron (7:05 p.m. ET on MiLB.TV)
More top prospect probables Brian Johnson (Red Sox's No. 15), Pawtucket at Rochester (Triple-A) Shawn Morimando (Indians' No. 17), Columbus vs. Louisville (Triple-A) Drew Anderson (Phillies' No. 23), Lehigh Valley vs. Scranton/Wilkes-Barre (Triple-A)
Ryan Helsley (Cardinals' No. 24), Memphis at Colorado Springs (Triple-A)
Corbin Burnes (Brewers' No. 7), Biloxi at Mobile (Double-A)
Brad Keller (D-backs' No. 12), Jackson at Tennessee (Double-A) Enyel De Los Santos (Padres' No. 13) vs. James Naile (A's No. 30), San Antonio at Midland (Double-A)
Genesis Cabrera (Rays' No. 15), Montgomery at Chattanooga (Double-A)
Framber Valdez (Astros' No. 18), Corpus Christi at Frisco (Double-A)
Jon Harris (Blue Jays' No. 20), New Hampshire at Portland (Double-A) Yefry Ramirez (Orioles' No. 23), Bowie at Richmond (Double-A) Chase De Jong (Mariners' No. 24), Arkansas at Springfield (Double-A)
Corey Oswalt (Mets' No. 29), Binghamton vs. Hartford (Double-A)
Scott Blewett (Royals' No. 7), Wilmington vs. Lynchburg (Class A Advanced)
Gregory Soto (Tigers' No. 10), Lakeland at Tampa (Class A Advanced)
Caleb Ferguson (Dodgers' No. 21), Rancho Cucamonga vs. Lake Elsinore (Class A Advanced)
Joey Wentz (Braves' No. 9), Rome vs. Columbia (Class A)
Tony Santillan (Reds' No 13), Dayton vs. Bowling Green (Class A)
Matthias Dietz (Orioles' No. 24), Delmarva vs. West Virginia (Class A)
Brady Aiken (Indians' No. 25), Lake County vs. Lansing (Class A)
Nolan Watson (Royals' No. 26), Lexington at Hagerstown (Class A) Luis Martinez (White Sox No. 30), Kannapolis at Lakewood (Class A)
Sam Perez (Marlins' No. 17), Batavia at Williamsport (Class A Short Season)
Oscar Tovar (A's No. 26), Vermont at Hudson Valley (Class A Short Season)
Mike Rosenbaum is a reporter for MLB.com. Follow him on Twitter at @GoldenSombrero. This story was not subject to the approval of Major League Baseball or its clubs.