"Mets ace Johan Santana threw off a mound Tuesday for the first time since pitching three scoreless innings in his first rehab start on July 28, TCPalm.com reports.

The Mets put Santana's rehab on hold for three weeks after the lefty felt shoulder discomfort following his lone rehab start. Mets general manager Sandy Alderson watched Santana throw at the team's minor league complex in Port St. Lucie."