Robles recorded multiple hits for the fourth time in his last six games on Saturday, going 2-for-4 with a double in Double-A Harrisburg's loss to Binghamton. The 20-year-old center fielder, No. 5 on MLB Pipeline's Top 100 Prospects list, is hitting .326 with six extra-base hits in 13 games since being promoted from the Carolina League, where he slashed .289/.377/.495 with 39 extra-base hits, 49 runs scored and 16 steals in 77 games for Class A Advanced Potomac.
Pitcher to watch: Mitch Keller (Pirates' No. 2), Altoona at Trenton (5 p.m. ET on MiLB.TV)
Keller, the No. 22 overall prospect, will be making his Double-A debut when he takes the mound for Altoona. The 21-year-old right-hander was dominant in his final three starts for Class A Advanced Bradenton, posting a 1.42 ERA in 19 innings while holding hitters to a .182 average. Overall, Keller pitched to a 2.99 ERA with a 0.98 WHIP and .204 opponents' average during his time in the Florida State League, striking out 71 and 21 walks in 81 1/3 innings.
Duel of the day: Dillon Peters (Marlins' No. 4) vs. Jordan Guerrero (White Sox No. 23), Jacksonville vs. Birmingham (3:05 p.m. ET on MiLB.TV)
Peters is set to make his third start for Double-A Jacksonville since returning from the fractured thumb he suffered on April 17. In his two previous turns, the 24-year-old lefty tossed a combined 11 innings, allowing three earned runs on nine hits while walking three and striking out nine. Before that he made a pair of scoreless starts in the Florida State League, where he permitted five hits and struck out nine over 10 frames.
Opposing Peters for Birmingham is another lefty in Guerrero, who enters his 21st start this season sporting a 3.71 ERA through 121 1/3 frames. He's struck out 117 and walked 31 in that span, while limiting opposing hitters to a .256 average and six home runs. The 23-year-old southpaw will look to get back on track after giving up three or more earned runs in two of his last three starts.
More top prospect probables Ryan Merritt (Indians' No. 22) vs. Myles Jaye (Tigers' No. 23), Columbus vs. Toledo (Triple-A) Ryan Yarbrough (Rays' No. 23), Durham at Norfolk (Triple-A)
Nick Neidert (Mariners' No. 2), Arkansas vs. Tulsa (Double-A)
Foster Griffin (Royals' No. 6) vs. Ryan Helsley (Cardinals' No. 24), NW Arkansas at Springfield (Double-A)
Sean Reid-Foley (Blue Jays' No. 7), New Hampshire vs. Richmond (Double-A)
Jaime Barria (Angels' No. 8), Mobile vs. Montgomery (Double-A)
Trevor Clifton (Cubs' No. 9), Tennessee vs. Pensacola (Double-A)
Brad Keller (D-backs' No. 12), Jackson at Chattanooga (Double-A) Touki Toussaint (Braves' No. 15), Mississippi vs. Biloxi (Double-A) Casey Meisner, (A's No. 28), Midland vs. San Antonio (Double-A)
John Means (Orioles' No. 30), Bowie at Portland (Double-A)
Jon Duplantier (D-backs' No. 2), Visalia vs. Stockton (Class A Advanced) Dane Dunning (White Sox No. 11), Winston-Salem vs. Potomac (Class A Advanced) Dillon Tate (Yankees' No. 15), Tampa at St. Lucie (Class A Advanced)
Ranger Suarez (Phillies' No. 16), Clearwater at Palm Beach (Class A Advanced)
Caleb Ferguson (Dodgers' No. 21), Rancho Cucamonga vs. Lancaster (Class A Advanced) Pablo Lopez (Marlins' No. 23), Jupiter at Fort Myers (Class A Advanced)
Spencer Turnbull (Tigers' No. 24), Lakeland vs. Daytona (Class A Advanced)
Adonis Medina (Phillies' No. 10), Lakewood vs. Hagerstown (Class A)
Darwinzon Hernandez (Red Sox's No. 17), Greenville at Charleston (Class A) Josh Pennington (Brewers' No. 22), Wisconsin vs. Cedar Rapids (Class A)
Patrick Murphy (Blue Jays' No. 24), Lansing at Dayton (Class A)
Jose Paulino (Cubs' No. 30), South Bend at Bowling Green (Class A)
Cole Ragans (Rangers' No. 6), Spokane vs. Eugene (Class A Short Season)
Nick Raquet (Nationals' No. 16), Auburn at Williamsport (Class A Short Season)
Oliver Jaskie (Mariners' No. 21), Everett at Salem-Keizer (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.