Seattle Mariners infield prospect Michael Arroyo is emerging as a potential late-season call-up. Arroyo began the 2026 season at the Double-A level but has since moved up to the top club. Through his first 65 games of the Double-A season, Arroyo held a .287/.364/.456 slash line with 12 doubles, 10 home runs and 13 stolen bases. This production earned him a call-up to Triple-A Tacoma. Through his first 38 games with the top club, Arroyo has held a sharp .270/.341/.472 line with nine doubles, seven home runs, and two stolen bases. With Brendan Donovan shifting back to the injured list and Colt Emerson being demoted to Triple-A, Arroyo does have a path to emerge as a potential option for the Mariners as they look to claim a spot in the postseason.

Minnesota Twins outfield prospect Walker Jenkins has enjoyed a surge at the Triple-A level and is on the verge of earning the call to the major leagues. Over his last 11 games at Triple-A St. Paul, the young outfielder has only gone hitless once and has carried an elite .452/.558/.881 line over this stretch. Over these 11 games, the outfielder has gone deep five times and swiped six bags. While injuries have limited his playing time, when active, Jenkins is among the most productive bats in the upper minor leagues. On the season, Jenkins has held a .306/.406/.525 line with 17 doubles, 11 home runs and 16 stolen bases across 67 Triple-A games. Even though there is not a clear path to MLB at-bats at this time, Jenkins' current production puts him in a prime position to earn a late-season taste of MLB pitching.

Washington Nationals infield prospect Seaver King has seen his production soar at the Triple-A level and is making a strong case to be viewed as the No. 1 prospect to start in all of fantasy baseball. Over his last 20 games, King has posted an elite .388/.490/.762 slash line with four doubles, one triple, eight home runs, and five stolen bases. King began the 2026 season at the Double-A level, where he posted a similar .336/.427/.562 line with a .989 OPS. In total, the top-ranked infield prospect in D.C. has posted a dominant .325/.410/.563 line with 18 home runs and 14 stolen bases over 88 MiLB games this season. While the Nationals are out of the playoff race, King has put himself in strong consideration to earn a cup of coffee with the club, which would set him up for a larger role in 2027. His five-category upside puts him high on all stash rankings ahead of Week 22.

Seattle Mariners outfield prospect Lazaro Montes has enjoyed a power binge at Triple-A and has put himself in a prime position to join the Mariners for the final stretch. Over his last 18 games at the top club in the system, the top outfield prospect has been nothing short of dominant. During this noted stretch, Montes has launched nine home runs and added four doubles while carrying a .324/.415/.761 line. Through 38 total games at the Triple-A level, the 21-year-old has held a .286/.369/.597 line with 12 long balls. Earlier in the season, Montes appeared in 79 games at Double-A, where he posted a .234/.369/.550 line with 25 round-trippers. Given his immense power upside and recent surge, Montes may not only debut later this season, but also provide a high-impact down the stretch.