Arizona selected Ryan Waldschmidt’s contract to the majors on May 8, 2026, a day the Diamondbacks also designated Alek Thomas for assignment and activated first baseman Tyler Locklear from the injured list before optioning him to Triple-A Reno. The move put the 23-year-old Waldschmidt into a big league clubhouse after a fast climb through the system and pushed Thomas, a former second-round pick, off the roster at 2:39 p.m. CDT.
Waldschmidt arrived with the profile Arizona wanted to see. Baseball America listed him as its No. 41 prospect in a recent top-100 update, and the 6-foot, 205-pound right-handed hitter backed that up in Reno with 156 plate appearances, a.289/.400/.477 line, three home runs, nine doubles, three triples and six stolen bases. He also walked at a 12.2% clip and struck out 24.4% of the time, while showing the kind of all-fields athleticism that gave him experience at all three outfield spots, even if most scouting reports project him as a corner outfielder.
Thomas’ exit made the opportunity real. The 26-year-old has played in parts of four major league seasons and has never topped nine homers or an 81 wRC+, and this year he was hitting.181/.222/.340 with a 23% strikeout rate before Arizona ran out of room to keep carrying him. He is also out of minor league options, which made a demotion impossible and forced the club to decide whether to keep him on the active roster or move on.
That decision came with the Diamondbacks still looking for more offense. Arizona ranks 19th in runs scored and 22nd in home runs, and Waldschmidt gives the club a younger bat with a more complete Triple-A line than Thomas offered this season. Waldschmidt entered the year as a top-tier prospect and already has the power speed mix that stood out last season, when he hit 18 homers, a career high. For now, the call-up is the test: whether his on-base skills and extra-base pop from Reno can survive the jump and help a lineup that has been waiting for another impact bat.
The roster shuffle also sent a clear message about timing. Arizona did not wait for Waldschmidt to force the issue with a longer Triple-A track record, and it did not protect Thomas with a softer move. The club chose the prospect with upward momentum and the roster spot that made the least sense to keep as the season moved forward.
Alek Thomas designated as Diamondbacks call up top prospect Ryan Waldschmidt
