Diekman signed a one-year, $4 million contract with the Mets on Friday, Anthony DiComo of MLB.com reports.
The deal also includes a vesting option for 2025. Diekman held a 2.18 ERA and 53:25 K:BB over 45.1 innings for the Rays last season after being released by the White Sox. The left-handed reliever has a long history of control problems and swing-and-miss ability and the Mets will be hoping for more of the latter than the former in 2024.