Manaea (shoulder) threw a 20-pitch bullpen session Tuesday, his first since last September's surgery, Martin Gallegos of MLB.com reports.
Manager Bob Melvin remarked that Manaea's session consisted solely of fastballs and went off without a hitch. It's an encouraging first step in what's expected to be a relatively extensive rehab process for the southpaw, and he'll likely repeat the process at some point toward the end of the week.