He did well in his Major League debut, holding the Royals to two earned runs over six innings on April 21. Start No. 2 was a disaster, however, as Webster was shelled by the Twins for six hits and eight runs over 1 2/3 innings on May 8.
"He got predictable against a good fastball-hitting team. I think he learned an important lesson, or at least one challenging experience, that I'm sure served him well as he continues to develop," said Red Sox manager John Farrell.
In 10 starts at Pawtucket, Webster is 5-1 with a 2.98 ERA.
"Much better command [of late]," said Farrell. "And particularly to his fastball. He's worked deeper into games. He's been a little bit more efficient. The stuff has been very consistent, similar to what we've seen here in the two starts than what he showed us in Spring Training. We're looking forward to seeing him here Saturday."
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.