The club remains unsure when they will get Buchholz (9-0, 1.71 ERA) back.
"Continued progression in terms of intensity and volume," said Red Sox manager John Farrell. "A good day."
What are the Red Sox looking for before Buchholz gets back on a mound?
"Well we're hopeful with each session there is gradual increases in intensity," Farrell said. "And I think until he feel like he's cut the ball loose from those distances without any restriction or holding anything back, that's the main goal of that phase. At that point, that's when we look to get him on the mound."
Ian Browne is a reporter for MLB.com. Read his blog, Brownie Points, and follow him on Twitter @IanMBrowne. This story was not subject to the approval of Major League Baseball or its clubs.