Double-A Reading placed DeMartini on the 7-day injured list May 7 with a sprained left wrist, Josh Norris of Baseball America reports.
The 23-year-old third baseman slashed .274/.361/.432 with four home runs, six steals, a 24.1 percent strikeout rate and a 108 wRC+ in 24 games prior to the injury. DeMartini was well below league average (68 wRC+) in 66 games at Double-A in 2025.