Just when it appeared Triston Casas’ injury luck could not become much worse, the Boston Red Sox first baseman encountered another frustrating setback. The Red Sox announced Thursday that Casas underwent a successful arthroscopic procedure on his left wrist. #RedSox 1B Triston Casas today underwent a successful left wrist arthroscopy. — Red Sox (@RedSox) August 6, 2026He spent the offseason rehabilitating his knee and hoped to rejoin the Red Sox early in 2026. MORE: Chad Tracy Gets Honest About Sonny Gray After Red Sox WinInjuries Have Interrupted Casas’ Promising CareerThe difficult part for the Red Sox is that Casas has already shown what he can do when healthy.