Cobb (elbow) is set to throw a bullpen session Sunday to work on mechanics, Marc Topkin of the Tampa Bay Times reports.
Cobb's next rehab appearance will be pushed back to Tuesday or Wednesday as the Rays want him to throw a bullpen session to work on some mechanical issues. He's given up four earned runs over 1.2 rehab innings so far but Cobb and Rays manager Kevin Cash are saying the 28-year-old's struggles are not due to a setback with his elbow. Given the righty has not pitched in the majors since 2014, Tampa Bay will likely continue to take the necessary precautions to bring him back to his old form.