Free agent pickups: Trio of waiver-worthy prospects debut

The rookie parade continued through the past week, as a trio of top-40-overall prospects from Kiley McDaniel's May update -- all of them shortstops in the AL -- made their MLB debuts. Each of them has the potential to make an immediate impact, including in ESPN standard leagues. As was the case for the Detroit Tigers' Max Clark last week, these promotions came in advance of the August 14 date which represents fewer than the 45 days of service time needed for a player to expire his rookie eligibility for the following year. As such, none will be eligible for 2027 Rookie of the Year honors, unless any are returned to the minors before year's end. That illustrates their importance to their respective teams, all of which fancy themselves as postseason contenders. George Lombard Jr., SS, New York Yankees (23.1% rostered in ESPN leagues): Everyone seems to love a Yankees prospect and, while many of us might have been burned by the franchise's last shortstop phenom Anthony Volpe, Lombard seems like a prospect whose future star shines a little brighter. Lombard might lack the gaudy HR/SB minor league numbers that Volpe had at the time of his 2023 debut, but Lombard had more patience -- a 14.8% walk rate in the minors, compared to Volpe's 13.0% at the time of his debut. He also has a more level stroke in his 24.5% line drive and 33.8% fly ball rates, compared to Volpe's 18.9% and 52.6%. Plus, he made his debut one year younger. The Yankees' failure to make a dramatic move to address their left-side infield shortcomings at the deadline signaled their belief in Lombard as a shortstop solution, and he's dropping into a lineup and ballpark that's conducive to good fantasy production. That will only strengthen if and when Aaron Judge, Cody Bellinger and/or Giancarlo Stanton return from the IL. Per Statcast, Lombard already has 16.7% Barrel and 41.7% hard-hit rates during his first big-league week, which are both above-average numbers. Lombard is also speedy enough to contribute 25-plus stolen bases over a full season's time. Kaelen Culpepper, SS, Minnesota Twins (5.4% rostered): Seeking to upgrade their shortstop position which posted MLB's fifth-worst wOBA (.282) at the time of his promotion, the Twins summoned Culpepper on Friday. Selected 21st overall in 2024, Culpepper hit .277/.367/.463 while averaging 28 home runs and 35 stolen bases (per 162 games played) across parts of three minor league seasons since, demonstrating a multi-category contribution that should be most valuable in rotisserie scoring. He might have been recalled sooner if not for glute and hand injuries that cost him time in Triple-A ball over the past two months. Still, Culpepper probably faces more of an adjustment curve to major league pitching than Lombard. That said, his upside is reasonably close, even in ESPN standard scoring. Angel Genao, SS, Cleveland Guardians (3.2% rostered): The first player in Guardians history to record four hits in his MLB debut, Genao flashed quite the spark for the team during his opening week, batting .368/.429/.526 with a home run over five games. He brings potentially elite plate discipline -- with career 11.3% walk and 81.3% contact rates in the minors -- and above-average speed. It's a skills combination that's as handy in rotisserie as it is points-based scoring. Genao's 49.4% career ground ball rate hints that he'll need to generate more lift in order to be a top-tier fantasy option in the majors, but he's also a player who shouldn't need a long time to adjust to the game's top competitive level in terms of pitching. All three of these prospects bring a fair degree of risk, but each also brings a level of upside that fantasy managers won't otherwise be able to find on the waiver wire this late in the season. Deeper league pickups Deep (12-team mixed): Luke Weaver, RP, Pittsburgh Pirates (11.8% rostered) Weaver deserves inclusion here for the heightened chance he'll recapture a closer role for his new team, as he had back during his 2024-25 days with the Yankees. He has been absolutely outstanding since the beginning of May -- his 0.27 ERA is best in the majors during that time -- and the Pirates are lacking in clearly superior ninth-inning alternatives. Weaver hasn't gotten a save chance yet for his new team, but bear in mind that in their first five games with him on the roster, they've lost four. He belongs on a fantasy roster in all leagues, as a pitcher with top-10 positional potential. Deeper (15-team mixed): Osleivis Basabe, SS/2B/3B, San Francisco Giants (3.4% rostered) A fellow shortstop prospect recalled in recent days, Basabe has been on quite a tear for the rebuilding Giants, batting .276 with three home runs in eight games already this month. Though not close to the same level of prospect as any of the previous three examined, he hit a respectable .259/.337/.401 while averaging 14 homers and 14 steals (per 162 games) for Triple-A Sacramento between 2025 and 2026. The ceiling isn't especially high here, but Basabe's chances for regular playing time make him well worth the pickup in 15-teamers. Deepest (AL- and NL-only leagues): George Klassen, SP, Los Angeles Angels (0.3% rostered) Another prospect getting an expanded opportunity following the trade deadline, Klassen stepped into the depleted Angels rotation on Friday, scoring five fantasy points on the road against the Miami Marlins. It's hardly an eye-popping score, but the right-hander had been on a hot streak for Triple-A Salt Lake at the time, posting a 4-1 record and 2.59 ERA in his most recent eight starts there. He's also a hard thrower (96.5 mph average thus far in the majors) with a K-generating slider (46.2% whiff rate), representing a skill set well worth speculating upon in "only" leagues.