Cobb (elbow) threw a 35-pitch bullpen session Tuesday that included breaking balls, Marc Topkin of the Tampa Bay Times reports.
The introduction of the pitch type to his rehab process is another milestone for Webb in his ongoing recovery from May 2015 Tommy John surgery. The 28-year-old posted a combined 21-12 record for the Rays in the 2013-2014 seasons over 49 starts, generating a sub-3.00 ERA in each of those campaigns as well. He continues to target a potential mid-season return to the big league club.