St. Louis Cardinals outfield prospect Joshua Baez has enjoyed an incredible stretch at the plate at Triple-A and is on the verge of earning the call to the big leagues. Through 64 total games with the Memphis Redbirds, the outfielder has held a dominant .275/.343/.628 line with 24 home runs and 12 stolen bases. Over his last 14 contests (since June 2), the outfielder has been even more impressive at the dish, launching eight of these home runs with a .368/.381/.877 line. On June 16, Baez made headlines across the minor leagues, slugging four long balls in a single game. However, despite this level of play, the Cardinals have yet to turn to him. Even though Lars Nootbaar and Nathan Church are both back in action, Baez's current production should pave the way for him to join the MLB roster before the end of the month, especially if they remain in the Wild Card race. He remains an elite prospect to stash in all standard leagues ahead of Week 13.

St. Louis Cardinals left-handed pitching prospect Quinn Mathews has begun to turn the corner at Triple-A and is quickly emerging as a top prospect to stash among pitchers. Mathews turned in a dominant debut season in the St. Louis system in 2024 but has yet to return to that level of play. In 2025, he logged only 99 innings and saw those troubles linger early in 2026. Through his first 35 2/3 innings this season, the southpaw posted a hefty 5.55 ERA with a 1.63 WHIP. During this stint, Mathews posted a rough 44:30 K:BB. However, over his last 21 innings of work (four starts), the former Stanford standout has held a stellar 1.71 ERA with a much-improved 28:9 K:BB. While he may need to show this success over a longer stretch, he has a clear path to the majors given St. Louis' weak rotation. He is a viable target in the 12+ team leagues ahead of Week 13, but can quickly enter priority stash range if he turns in a strong conclusion to June.

Seattle Mariners left-handed pitching prospect Kade Anderson has seen his short-term fantasy stock take a hit this past week, but the budding ace remains firmly on the stash radar. The Mariners acknowledged that they will be looking to "piggyback" each of their MLB starters and do not view Anderson as part of their immediate plans. While this could change in the second half, for now it appears the former LSU superstar will remain in the minor leagues for the foreseeable future. However, during his first taste of professional baseball, the southpaw has looked nothing short of dominant, posting an elite 1.13 ERA, 0.66 WHIP, and an 82:7 K:BB over 55 2/3 innings of work. While his path to the majors is not overly clear, his upside remains elite, making him a top-stash candidate in standard formats with NA spots.

Seattle Mariners outfield prospect Lazaro Montes has had a strong start to the Double-A regular season and is establishing himself as one of the top emerging power hitters in the minor leagues. Across 64 games with Double-A Arkansas, the young slugger has gone deep 20 times while holding a .237/.346/.543 line and an .889 OPS. Since the start of June, Montes has been even more dominant at the plate, launching eight of these long balls and carrying a .316/.409/.772 line. This elite play has put himself in strong contention to earn the call to Triple-A, which will open the door for a second-half debut. While fantasy managers will need to wait for him to move up to Triple-A before declaring him a top stash candidate, he is firmly on the watch list, given his elite power upside. If he maintains this pace, he could provide a major spark to a Mariners lineup as they look to clinch a spot in the postseason down the stretch.