Mayer (forearm) has been cleared to start his hitting progression with dry swings, Tim Healey of The Boston Globe reports.
Healey notes that Mayer is "still weeks away" from returning to major-league action. However, it's a step in the right direction for Mayer, who has been sidelined by a stress reaction in his left forearm since June 25. The Red Sox should have a more clear idea of Mayer's return timeline once he's cleared to embark on a rehab assignment.